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Guangzhou DaLong CNC Machinery Technology Co.Ltd is dedicated to delivering led bulb for our customers. The product is designed to incorporate the highest level of technical specifications, making itself the most reliable one in the competitive market. Moreover, as we resort to introduce cutting-edge technologies, it turns out to be more cost-effective and durable. It's expected to maintain the competitive advantages.All products under the brand DaLong Machine create tremendous value in the business. As the products receive high recognition in the domestic market, they are marketed to overseas market for the stable performance and long-term lifespan. In the international exhibitions, they also surprise the attendants with outstanding features. More orders are generated, and the repurchase rate excels other suchlike. They are gradually seen as the star products.Samples are included in the service system at DaLong CNC Machine for led bulb. We can also provide customization service according to the design and specifications offered by the customers.
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Blown Bulb also Blows Main Fuse?
Blown Bulb Also Blows Main Fuse?it truly is totally well-known behaviour for filament bulbs. at the same time as the filament breaks, one or different loose end can short adversarial to the different terminal. Neither CFL nor LED bulbs have this problem (the rectifier diodes in a CFL can theoretically fail short-circuit, besides the undeniable fact that it truly is totally uncommon in prepare).— — — — — —Best LED Grow Lights (2021 Buyers Guide)Growing plants has always been synonymous with daily physical labour in the great outdoors. The needs for tons of acreage, powerful equipment and good weather for productive harvests have and still dictate, to a large degree, how plants are grown outside. Whether it's running a farm or gardening for fun, most folks will be outside, in the dirt and at the mercy of mother nature. However, in this day and age, more and more people are choosing to grow plants indoors. Why, might you ask? Well for one, we have the knowledge and technology to do so successfully. Another main reason is that indoors, you take the place of mother nature. You can be in charge of things like water, light, humidity and even ventilation. In other words, indoors, you do not have to worry about being at risk from inclement and unpredictable weather. People also love growing indoors because you can be more in charge of pests and plant diseases. Indoors, it's always growing season. You can grow year-round and not wait for the traditional Spring and Summer months to be the most productive seasons of the year. You can amplify your growing and harvest cycles to 2-3 times a year instead of just one time, no longer relying on the weather to dictate your growing schedule. And for all those reasons, indoor plants tend to be of higher quality. If you've ever seen a tomato grown indoors in a greenhouse compared to a tomato grown in the field (or any vegetable for that matter), then you know exactly what I mean. Indoors plants live less stressful lives with regards to weather, pest and disease, and so oftentimes, they satisfy higher quality standards. Things like shape, colour, smell and flavour are all enhanced. So, if you are tired of getting sunburned in the garden, or want to decorate your home with some new plants, then making sure you have the proper set-up indoors will be key to your success (and the success of your plants). One component of that set-up is light. So, let's learn more. The Low Down on LED Grow Lights At this point, we've all heard and used LED to describe a type of light. But do we actually know what we are talking about? Or what LED even stands for? Well, time to become enlightened (pun intended). LED stands for light-emitting diode. Not a bad name for a band, if you ask me. LEDs are special because they emit light using an electrical current that passes through a microchip which then illuminators the light-emitting diode. LEDs are directional light sources, meaning they provide light in a specific direction. This process makes them produce light that is about 90% more effective than traditional incandescent light bulbs. And they do so without emitting any heat. Because of this, LEDs also tend to be more versatile and last longer. Traditional incandescent and compact fluorescent lightbulbs (CFL) emit light and heat in all directions. On the other hand, incandescent light bulbs produce light by using electricity to heat up a metal filament until it becomes "white" hot. In this process, incandescent bulbs release 90% of their energy as heat. In CFLs, electrical current flows between two electrodes at each end of a tube that contains gases. This reaction produces ultraviolet light and heat. The ultraviolet light is then transformed into visible light when it strikes a phosphorus coating on the inside of the bulb. There are three common forms that are most popular for LED grow lights: panels, bars and bulbs. Let's take a look at the pros and cons of each. Panels are probably the most common when it comes to indoor growing. One reason for their popularity is that many come with heatsinks- mechanisms that are designed to remove excess heat from the light fixture. Now is a good time for a quick side-note on heatsinks. If you thought that LEDs did not produce heat, you would not be entirely wrong. LEDs are cool to the touch. But within the mechanisms themselves, there is still plenty of heat. Other pros of LED light panels are that they provide the full spectrum of light to accommodate the various growing stages of your plants and to mimic natural light. They do this by providing a balanced spectrum of red, blue and green light. They come ready to "plug and play" with any standard electrical outlet and are designed to run for a very, very long time. We are talking decades worth of light life here people. The con for a full-sized LED light panel, is simply the cost. Panels are by far the most expensive way to provide high-quality LED light to your indoor plants. Light bars are as if you took a single row of diodes from a light panel and used it as a standalone tool. They are handy because you can easily increase your light footprint without investing in an entire new LED light panel. Another pro for single row light bars is that you can vary the light spectrum you are providing your plants. LED light bars should be thought of as supplemental light to whatever main light source you are using. Due to their supplemental nature, one con is that unless you invest in multiple light bars, they are hard to use as your sole light source. They often come in just one light spectrum and are unable to switch to different ones. Light bulbs are singular sources of LED light. Most even have the same, traditional shape as CLF and incandescent bulbs. LED light bulbs cannot be plugged in like panels or light bars. But they will fit into any standard light socket. A pro for LED bulbs is that if you have multiple, they can be used to provide different spectrums of light. You can customise what type of light you provide your plants and where you place it. An obvious con for LED light bulbs is that unless you are lighting a singular plant, you will need multiple light fixtures and bulbs to provide your plants with the full spectrum that you need. If you are at the point where you've got a handful of fixtures and bulbs for your plants, it may be time to upgrade to a singular light panel or a series of light bars. LED grow lights will come with some sort of wattage number attached. Very high watts will produce greater light than LED lights with low watts. However, just knowing how many watts a light produce is not the most helpful metric. After all, watts are only a measure of electricity. What you really should consider is the amount of light that is being produced by those watts. And the wavelengths that are being produced. Knowing how much light the LED is capable of providing, and the type of light (as related to the colour spectrum) the LED diodes can create, are much more effective parameters to consider. As mentioned above, when comparing LED lights to incandescent and CFL light bulbs, LEDs tend to be more efficient than older lighting technology. However, not all LED grow lights are the same efficiency-wise. It depends on quality. The fact of the matter is that a good LED build is only 80% efficient. The other 20% is converted to heat. If you want to ensure that your LEDs are as efficient as possible, it is okay to spend some cash. Remember, these things should last for decades. Which takes us to our next point, durability. If you are considering your LED purchase as an investment, then you will want to keep it around a long time to make it worth your while. Purchasing an LED lighting system that comes from a trusted brand, is constructed from high quality materials and is protected under some sort of warranty is the best course of action. Peace of mind that your purchase is protected is priceless. Choosing the correct LED grow light will depend on the type of plants you are growing, and the scale in which you are growing them. If you have many plants and need to create a larger footprint of light, then choosing a LED panel is what will make your plants grow the best. If you have a smaller area of plants, or simply want to supplement the light you already have, then consider using an LED light bar. And if you have a couple household plants in a small indoor gardening operation, then simply outfitting each one with LED bulbs (with the correct spectrum) can be all that you need for those plant-babies to be successful. With any option that you choose, it will be crucial to determine that the panel, bar or bulb you are using emits the proper type of light. If you have a high-quality panel, chances are it will come with diodes that provide the full spectrum your plants need, including some IR and UV light. If you have chosen an LED bar, making sure of what colours it utilizes will be crucial, especially if it cannot toggle between colour types. And for LED bulbs, the chances are that it will not be able to change its spectrum, so investigating what color is best for the specific type of plant (and the stage of life that the plant is in) will be important. So, start with determining what type of plant or plants you want to grow inside. Determine where in your home they will grow and how they will be orientated to receive light. Then, decide on the best LED grow light that produces that most efficient colour wavelengths for your plant choices. Sit back and enjoy. But do not forget to water!
Panasonic to Release Led Bulbs with Wide Light Distribution Angle of Approximately 300 Degrees.
Osaka, Jan 26, 2011 - (JCN Newswire) - Panasonic Corporation today announced that it will release two models of standard type EVERLEDS LED bulbs featuring the wide light distribution angle(1) of approximately 300 degrees on March 18, 2011 in Japan.Consumers have become increasingly conscious of energy conservation at home, including lighting. LED bulbs are quickly finding their way into homes thanks to their high energy efficiency and long life.However, applications of existing LED bulbs(2) are limited to illuminating spots beneath the lamps because of the bulbs' narrower light dispersion than incandescent bulbs. Although the existing LED bulbs are suitable for such areas as entrances, bathrooms and staircases, there are demands for LED bulbs that can distribute light at wide angle when used in diffusing panel covered lighting equipments and that can illuminate a broader area.Panasonic's new LED bulbs have responded such demands with the two key technologies: "optical design technology that spreads light using a combination of LED packages arranged in a circular pattern inside a large globe and a double reflector structure" and a "high heat dissipation technology with the circuit arranged above the LED packages in order for the circuit parts to be away from the body where the heat converges." As a result, the new LED bulbs provide the industry's widest light distribution angle of approximately 300 degrees, which is almost equivalent to the angle of incandescent lamps.The new LED bulbs can replace incandescent bulbs used in light fixtures that help disperse the light throughout the room, giving lighting effects with a light distribution angle almost equal to incandescent light bulbs.The new E-26 base LED bulbs come in two colors, warm lamp color (LDA7L-G) and daylight color (LDA7D-G) which has brightness equivalent to a 40W(3) incandescent lamp and boast a long service life of 40,000 hours.(4) Panasonic will strengthen its product lineup with these new bulbs and meet a diverse range of needs to further promote the replacement of traditional incandescent lamps.(5) (1) A value consistent with the definition of "beam spread" in the Japan Industrial Standards JIS Z8113 "Lighting vocabulary," and "luminous intensity distribution angle" specified in the Japan Electric Lamp Manufacturers Association Standards JEL 800 "LED Light Bulb Type Code Assignment Method," in comparison with Silica bulbs (2) Panasonic LED bulbs, including LDA7L-A1 (3) Indication of the brightness in accordance with the "LED Light Bulb Performance Indication Guidelines 008" issued by the Japan Electric Lamp Manufacturers Association. Comparison between LDA7D-G and the 40-W tungsten filament lamp for general lighting purposes specified in the Japan Industrial Standards JIS C7501 "tungsten filament lamps for general lighting purposes." (4) The rated life is the number of hours of use until the total luminous flux (brightness) becomes 70% of the initial value. The rated life shows an average value and is not guaranteed.(5) With some fixture types, the lighting performance may not be equivalent to that of incandescent lamps. If the clearance between the LED bulb and the shade of the lighting fixture is narrow, the area around the base may look dark. These LED bulbs cannot be used for fixtures with a dimmer function.About Panasonic Panasonic Corporation is a worldwide leader in the development and manufacture of electronic products for a wide range of consumer, business, and industrial needs. Based in Osaka, Japan, the company recorded consolidated net sales of 7.42 trillion yen (US$79.4 billion) for the year ended March 31, 2010. The company's shares are listed on the Tokyo, Osaka, Nagoya and New York (NYSE: PC) stock exchanges. For more information on the company and the Panasonic brand, visit the company's website at .Source: Panasonic Contact:Copyright 2011 JCN Newswire. All rights reserved.
Can Zimbabwe's Switch to LED Bulbs Curb Power Crisis, Meet Climate Goals?
HARARE (Thomson Reuters Foundation) - In 2015, Hope Dzimunya began changing the lightbulbs in her house, replacing the old bulbs with energy-efficient ones.For her, the reasons were both environmental and financial."There are at least nine bulbs in my house and they are all energy savers, they last long," said the 39-year-old, who works as a waitress in the mining town of Bindura, 80km (50 miles) north of Zimbabwe's capital, Harare.Dzimunya decided to switch over even though she had missed a handout of low-energy lightbulbs to households a few years previously.In 2011, struggling with a 20 year power crisis, ZESA Holdings - the state power utility and Zimbabwe's only power supplier - rolled out a $12 million campaign to distribute millions of free energy-efficient bulbs.The company hoped the campaign would encourage users to give up the more familiar but inefficient filament bulbs and fluorescent tubes, as part of measures to conserve energy.Now the government is trying to push all consumers to switch to more efficient lighting - by banning the older kinds of bulbs.The switch could have a dramatic impact on Zimbabwe's climate change goals, preventing the equivalent of 1,300 gigatonnes of carbon dioxide emissions over the next 13 years, according to the government's plan drawn up under the Paris Agreement on climate.Zimbabwe aims to cut emissions by 33 percent - or 17,300 gigatonnes - by 2030, mostly by increasing investment in hydro and solar power and by improving energy efficiency, the government plan said.Nearly 40 percent of Zimbabwe's electricity supply comes from thermal power plants, 39 percent from hydro-power - which has been hampered by drought in recent years - and the remainder is imported, says ZESA Holdings.Banning energy-inefficient bulbs should help ease the country's power crisis, says the country's energy regulator, ZERA.At their worst in 2015, the shortages left thousands of homes without electricity for 18 hours a day.Power outages also cut production in the key industries of manufacturing and mining by over 55 percent between 2015 and 2016, according to a survey carried out by the Confederation of Zimbabwe Industries.Overall, Zimbabwe needs about 2,200 megawatts of electricity at peak consumption."The banning of inefficient lighting systems will reduce the country's electricity demand by 30 to 40 megawatts," Gloria Magombo, chief executive of ZERA, told the Thomson Reuters Foundation.The ban was introduced in January, and ZERA expects the switchover to more efficient bulbs to be completed by the end of the year.The energy saved can be used by the mining, agriculture and manufacturing sectors, Magombo said.Retailers and wholesalers who continue to stock the old-style bulbs, or consulting engineers that recommend inefficient lighting, are liable for a fine or face six months in jail.Conventional lighting still accounts for up to 15 percent of lighting in Zimbabwean homes, schools and businesses. And there is some resistance to switching over.In Bindura, Hope Dzimunya says the initial cost of purchasing the energy-saving lights may be off-putting to many consumers."The disadvantage is that they are expensive at first, but you don't have to replace them for up to two years if you buy the right one," she said.That is not always an easy choice, since consumers can be deceived by counterfeits. Dzimunya spent up to $5 each for her bulbs, but fakes that cost just $1.50 require replacement at least three times a month, she said.Experts say the LED bulb's average price of $3.50 (compared to $0.50 for the obsolete filament bulbs) pales in significance when compared to its long-term energy and cost benefits.LEDs can provide up to 50,000 hours of light - the equivalent of five-and-a-half years' continuous use, said Norbert Nziramasanga, an electronics engineer and former director of the Southern Centre for Energy and Environment in Harare.By comparison, the filament bulb burns out within 1,000 hours of use, making it at least seven times as expensive to buy over the same period, he said.Nziramasanga said the LED consumes just 15 kilowatt-hours (kWh) of energy per year when used for eight hours a day, costing $1.50 on average annually, while an incandescent bulb uses 130 kWh - making it nearly nine times as expensive to run.The Confederation of Zimbabwe Industries would like to see government back up the ban with incentives such as tax breaks to promote manufacturing of energy efficient lighting, said Busisa Moyo, who heads the industrial lobby group.But that is unlikely to happen, said ZERA's Magombo."No financial support will be provided to help either traders or consumers ... as incentives are already in place, which include scrapping of (import) duty on CFLs," said Magombo.With over 100 consumer action centers spread across the country, the Consumer Council of Zimbabwe, a semi-autonomous consumer representative body, has been working to promote efficient energy use in households since 2012, according to director Rosemary Siyachitema.Combined with ZESA Holdings' distribution of bulbs, the council says its outreach is finding currency with users.Marshal Chinyerere, a hotel chef in Bindura, replaced his old bulbs with the handouts three years ago."The new bulbs have helped reduce consumption of electricity in my home," he said.
Which Consumes Less Electricity, a Zero-watt Bulb Or a Small LED Bulb?
The name so given "Zero Watt" means it consumes a low power of 15W. It is normally switched ON when all the appliances go off at night. Since it consumes a low amount of power it is generally measured by old magnetic power meters rather than the digital meters.So it is better to use a small LED bulb of rating 3W rather than using a 15W bulb which consumes more energy• Related QuestionsWhat does it say about Democrats that they are for Obama pardoning pushers and drug abusers, but against Ford pardoning President Nixon?Nothing, most of them were serving overblown sentences for non-violent drug offenses. Also, he didn't use pardons a lot, he mainly commuted sentences because most of the applicants had served 20 or 30 years for non-violent drug trafficking. Even the hardest DARE supporter would probably find those sentences to be ridiculous. Seriously, you could be a serial child molester and not get the sentences that some of these guys got.Also, you'd be hard pressed to find anyone who thinks pardoning Nixon was a good idea, republican or democrat------Is the slowdown period of the Indian economy over?No, the slowdown is very much still around, and from how things look, it's here to stay. There is no effort from the government, and it is simply not possible for private companies to carry the economy at this stage. The government needs to step in, and in a big way, rather than ask the private enterprises and startups to come to the rescue.Sure, that will solve part of the problem, but not a major part of it------Is this sentence correct, "we had a plan to go home"?Pugazhendi, your sentence "We had a plan to go home." seems to imply that you have now changed your mind. If you are only to going to stick to your plan, then you should say "We HAVE planned to go home." If you don't understand / have any other queries, feel free to revert. . .!! Good Luck !!!!Is it correct sentence "we had a plan to go home" I'm telling this to someone currently but I already planned this?------What happens when a 110V (appliance, lamp) is connected to a 220V socket? When it is damaged, will it still work?It would not be good practice to connect an 110V >appliance
RGB LED Circuit Problem
A common anode RGB LED can be sketched in a schematic like this:simulate this circuit Schematic created using CircuitLabThe positive voltage has to be applied to the top, for all the LEDs together. To light the LEDs up, you have to sink the current on the other end, meaning providing ground level at the bottom of that schematic at the corresponding pins. The current will then flow from your 5V pin, through the LEDs into the Arduinos pin.That means, that analogWrite(pin, 0) will turn the LED on that pin ON and analogWrite(pin, 255) will turn the LED OFF. The logic is inverted here, because the Arduinos output pin is on the other side of the LED.So your circuit and code work perfectly, you just didn't expect the inverted logic.Note: The pins of the Arduino can only source/draw a certain amount of current (20mA continuously, 40mA at maximum) without getting damaged. A single, not too strong RGB LED should be OK, but as soon, as you want to drive more LEDs, you should consider using a driver circuit (for example simple transistors). That way the output pins don't have to provide the LEDs current, but only the current to control the transistor.• Related QuestionsWhy do the brightness, luminous efficacy and power of this lightbulb not agree?Here a similar bulb from same brand in a different country (Canada) is 8.5W 800 Lumens Note they dropped the efficacy spec., possibly correct ! who knows. only your Test Engineer knows for sure.If they started with emitters that were regulated to 7.5W with 106 lumens/Watt sources and had a design with 0.5W loss (14%) then it would use 8W with 100 lumens/Watt. The same bulb at 5000'K but with warm white might absorb 10% more energy to convert the blue source to warmer phosphor emissions and get only 95 lumens/Watt. Yet so many suppliers say they have the same efficacy for any CCT temperature from warm to cool. (Warning fake data)Go to a reputable source like Philips, Cree, etc for better data,.For what it's worth I have bought both warm and neutral white 5000'K in this brand from this suppier and the latter are awful white balance (poor CRI) and hideous so my wife insisted I change them in the hallway to warm white. My preference is tri-phosphor 4500k 4ft T8 tubes or 40004500'K custom LEDs. But this range is also the hardest to control in phosphor thickness and std deviation or consistency vs cool and warm------Why don't I need a resistance when testing a light bulb circuit in a breadboard?With LED's, a small increase in voltage will result in a large increase in current. So it is really hard to get just the right voltage to keep an LED at the right brightness. If you let the voltage just get a tiny bit too high it may destroy the LED.What makes it even harder is that as the LED gets hot, the current will also increase. Naturally when you power it up it will tend to get hot. As a result it is just too much trouble to drive an LED with a voltage. Some form of current limiting usually has to be put in place. It doesn't have to be a resistor, but that is probably the most simple way to do it.LED light bulbs have circuitry integrated into them that overcomes all these problems.Old-fashioned incandescent light bulbs (including halogen bulbs) are different. The part that lights up is made from a thin tungsten wire that glows when it gets hot. The wire has resistance which limits the current automatically. This resistance is also what causes it to heat up. And, icing on the cake, the resistance goes up with temperature, so incandescent light bulbs are really stable when powered from a voltage source------Single Pole Motion Sensing Light SwitchTL;DR YesFull answer: Normally the only restriction is the amount of power. An ordinary switch will be rated for the full power of the circuit - e.g., 1875 W for a 15 A circuit. However, a smart switch, dimmer, motion switch, etc. is much more complex and will typically be rated for less total power. That helps save money as the electronic components don't need to be designed to transmit, switch, dim, etc. as much power or to dissipate as much heat.The good news is that with CFL and now LED lights - which you should be using pretty much everywhere now as the power savings pay for the bulbs very quickly - the power ratings of switches are typically far more than ordinary residential needs. For example, if you have 2 3-bulb fixtures, in the old days (incandescent), that could easily be 6 x 60 W 360 W. With typical CFL bulbs, the power used is 13 - 16 W, and with typical LED bulbs 9 - 10 W, for a total of 54 - 96 W.Just check the rating on the new switch and compare it with your existing bulbs & fixtures. There may be different ratings depending on the type of bulb, but 2 fixtures in a small hallway is unlikely to be a problem------Lifehack to remove GU10 lightbulbs from light fixture?I have this exact problem with one of my light fittings. When I bought the light, it came supplied with a special sucker for removing and refitting the bulbs. Stupidly, I used the device when the bulb was hot - and melted the soft rubber.What I now do is to use disposable latex gloves, pushing the front glass quite firmly with the extra grip of the thumbs is enough to turn the bulb for removal and refitting. If you have normal household rubber gloves, this will probably work even better, but I just happen to have latex ones and none of the others.Be aware, some (cheaper) GU10s have a very thin piece of glass with a square edge that is bonded to the front of the bulb. This square edge is razor sharp and will slice your thumb open without the gloves. Even with the gloves it is possible to cut yourself. Know your enemy!Extra tip - when you replace the bulbs next time, get really high quality LED bulbs. Not only will you get all of the standard benefits of LED bulbs, but they will last for around 7 years so you will minimise the number of times you need to change them in the future------Do LED dimmers work with non-LED bulbs?There are a number of different light technologies in use (e.g., incandescent, halogen, fluorescent, LED) and dimmers have evolved to handle each new type. But some are easier to dim than others. In general, if you have a light that is dimmable then if you use a new dimmer it will work with it as well as newer technology lights.For example, this Lutron dimmer can work with:You might wonder why fewer Watts of LED & CFL bulbs work than incandescent or halogen. There are technical reasons, but it doesn't matter because 150W of LED is comparable to 600W (or more!) of incandescent lighting - i.e., with any technology enough to light up a large room.On the other hand, this less expensive dimmer from the same manufacturer/product line can handle 600W of incandescent/halogen but clearly states that it is not LED or CFL.So the new dimmers are designed to handle the old light bulbs as well. Otherwise there would be a lot of problems as people upgrade dimmers without replacing the light bulbs at the same time. But plenty of people find out the hard way that you can't necessarily put a new bulb (LED or CFL) on an old dimmer------doesn't ohm's law applied to every thing? closeddoesn't ohm's law applied to every thing?No, Ohm's law describes ohmic devices only. From the Wikipedia article "Ohm's law":An element (resistor or conductor) that behaves according to Ohm's law over some operating range is referred to as an ohmic deviceBut there are many devices that are not ohmic such as capacitors, inductors, and PN junctions to name just a few. You will learn about these later in your studies.I've read that voltage is high in step up transformer due to greater no. of turns it makes sense but why it reduce current?A transformer is not an amplifier; it cannot increase the power. Ideally, there is no power loss (practically, there must be some loss).But power is the product of the voltage and associated current.$$p v cdot i $$Thus, if the secondary voltage is greater than the primary voltage, the secondary current must be less than the primary current in precisely the right proportion such that the primary and secondary powers are equal:$$v_P cdot i_P v_S cdot i_S$$or$$fracv_Sv_P fraci_Pi_S$$For example, if the secondary voltage is twice the primary voltage, the secondary current is half the primary current.------Dimmers don't turn on at low settingMany modern dimmable LED bulbs will dim with older dimmer switches, there are some issues. One is that the bulbs may not dim as low as they can, the other is that the bulbs may not come on at the lowest setting. You may need to bring them up and then back down. I've typically had issues with the first while you seem to be having problems with the latter.New CFL/LED compatible dimmers solve a lot of problems. In addition to being engineered to be more compatible with dimmable LEDs and CFLs they also have a low trim adjustment. Either a sliding switch, knob or some other mechanism to adjust the lowest dimming setting where the bulbs perform satisfactorily.There are still compatibility issues so it's best to see what dimmers are compatible with the bulbs you have. The manufacturers of dimmers (and usually the bulb manufacturers too) will have a compatibility list so you can get the right dimmer for your bulbs or vice versa.I got tired of not being able to dim my LED bulbs as low as I wanted so I replaced my dimmers and have been very happy. Most of my bulbs have been Philips and my dimmers Lutron C-L------Using an arduino to read a 5050 LED signalThe LEDs are almost certainly controlled via PWM, so the RGB signals are 12 V PWM.You can read these into an Arduino (with a slight loss of precision), by low-pass filtering the PWM signal to get an analog voltage between 0 and 12 V, and then adding a voltage divider to scale the 12 V down to a maximum of 5 V so that you can use the Arduino ADC to read the values. The order of the voltage divider and LPF is non-critical, either way works.However, beware that the impedance of the voltage divider will affect your LPF and vice versa, so you need to either carefully design your circuit, or add a buffer of some sort in between.One of the simplest ways to avoid this inter-circuit interaction would be to use the 12 V PWM to switch a MOSFET supplied from 5 V, effectively level shifting the 12 V down to 5 V, and then choosing an appropriate RC LPF to adequately smooth the 5 V PWM on the Arduino analog input. You will want to choose your filter cutoff based on both the PWM frequency and your expected response time (how fast you want to detect changes); a larger filter time constant will give you better accuracy at the cost of slower response time.
Questions and Answers on Led Bulbs
Who knew that LEDs would be the hottest topic in real estate? Judging by my reader mail, it's on many homeowners' minds, now that the manufacture of 40-, 60-, 75- and 100-watt incandescent bulbs has been phased out, a process that began in 2012 and ended on Jan. 1. To help homeowners navigate this momentous change in home lighting, I wrote a cover story for the Real Estate section in late December about the LED equivalent of the 60-watt incandescent, the most widely used of the phased-out bulbs. Reader mail poured in. Here are some of the questions I received and my responses. I'll answer more questions, including which brands I preferred in my home testing, Monday in my blog at Can an A19 LED (the bulb designed to replace Edison's iconic incandescent bulb) be used with the type of lampshade that clamps directly to the bulb? Yes. A clamp type of lampshade will not damage the bulb; the only issue is whether the shade will clamp over the bulb. The shape of some A19 LEDs differs quite a bit from the old-style incandescent, but all the ones I tested worked with a clamp lampshade, including Philips's SlimStyle, which is shaped like a mini ping-pong paddle. Do A19 LEDs work with dimmers? Yes, if the package says "dimmable." But the A19 LED bulb may not be compatible with the dimmers in your house, especially if they are more than 10 years old. Recognizing that this is an issue, both the dimmer manufacturers and the LED bulb manufacturers have worked hard to make their products compatible with each other. How can I find out if an A19 LED will work with the dimmer in my house? You can contact the manufacturer of the dimmer. (If the name is not visible on the faceplate with the light switch, you may have to remove it and look inside the switch box that is recessed into the wall.) Most A19 LED manufacturers list compatible dimmers on their Web sites.Alternatively, you can buy an A19 LED bulb and test it with your dimmer. You won't cook the bulb if the dimmer is incompatible; you just won't like the results. The symptoms of a mismatch are audial - a buzzing noise that increases with dimming - and/or a flickering, strobe-light effect.If your dimmers are compatible, you will still notice two significant differences compared with their performance with an incandescent bulb. The first is the amount of light that is still visible when the dimmer is turned all the way down. Because the LED is so much more efficient, the slightest amount of current will illuminate the bulb, but some dimmers can be adjusted so that no current passes through when the dimmer is turned all the way down.The second difference is the appearance of the dimmed light. As an incandescent bulb is dimmed, both the amount of light and the color temperature are reduced. The light becomes more reddish, which enhances your perception that it is becoming more faint. When an A19 LED is dimmed, only the amount of light is reduced; the color temperature of the light remains the same.As a consequence, when the LED is dimmed 70 percent, it will appear to be brighter than an incandescent dimmed an identical amount. Is there a three-way LED bulb? Readers who asked about this were especially interested in a three-way LED bulb that goes up to 150 watts (50/100/150) because they need the brighter light for reading. The good news here is that the three-way incandescent bulb is classified as "nonstandard" and it's still being manufactured. Also Ecosmart (Home Depot's house brand $20) offers a three-way A19 LED that's a 25/40/60-watt equivalent. Can an LED be used in an enclosed fixture? Yes, but only some brands. The issue is the amount of heat that can build up in the enclosed fixture. LED bulbs are very sensitive to heat; if the air in the enclosed fixture becomes too hot, it will shorten the life of the bulb.If you want to install an A19 LED 60-watt equivalent in an enclosed ceiling fixture (the most common type of residential enclosed fixture), read the packaging carefully. Most say that the bulb cannot be used in this way. The only ones I found that can be are Cree's A19 LED Soft White and its A19 Soft White TW Series. The fine print on Cree's packaging, however, warns against mixing bulb technologies in the fixture (using a LED with a CFL or an incandescent) because the other bulb types produce so much heat that they will adversely affect the LED. Katherine Salant has an architecture degree from Harvard. A native Washingtonian, she grew up in Fairfax County and now lives in Ann Arbor, Mich. If you have questions or column ideas, she can be contacted at or .
Can You Put a 75W LED Bulb in a Socket for a 60W Incandescent?
First of all... is it 75 WattequivalentLED or an actual 75 watt bulb. Those are two very different things there my friend.Aside from that clarification:wattage- usually the fixture would tell you what themax amount of wattageit can handle. I would assume in this question its 60W. So anything below and up to 60W is doable.socket- is it a E26 medium base? E12 Candelabra? GU24? GU4 (two pin)? There are a lot of sockets out there with equivalent retrofit LED bulbs that you can use. Make sure you know this information1. What is the lux (lx) data of a 7w, 8w, and a 10w LED Bulb?i've found they vary by type of led and make of bulb. ie; i found 1 which claims to be 5w at 400 lumen and a 7w which claimes to be 720, and a 13 which claims to be 1250 but actually is less htan a standard 40-60 watt incandescent. some are smd led and some are not.2. A 7W led bulb got broken (its outer case) but it is still working, would it emit harmful rays if I use it?Well, unfortunately there's a lot of different tech used in LED bulbs unlike incandescents which were always reliably a short piece of tungsten wire that got really hot.Fortunately there are not seriously toxic materials in LEDs. And there is no need for an evacuated bulb. The bulb may have several purposes. The LED may still work. However it may contain phosphors that give the a high output blue LED a more natural spectrum than a plain LED alone. This may wreck the spectrum and may not work as intended.It may also just be decorative to make it more light-bulbish-like. Broken it may or may not pose a shock hazard, I can not tell without seeing it, probably not likely.I really can not tell which kind you have so I would say throw it away and get a new one -if it had been incandescent or CFL you would be buying new anyway at this point. You can try and see if the light appear OK and still use it. It might pose a shock hazard or the light may be off-color3. When will YA Politics switch that CFL lightbulb to an LED bulb to save energy for 0bama?STOP IT!!! You are talking facts and logic. Democrats will Never understand.4. Can I use a 110 volt LED bulb in a lamp with 130 volt bulbs?Yes you can use them. The voltage of the lamp is 110V, it's just that the original globes are rated a bit higher5. can i connect an 1.2v LED bulb to a 1.5v D battery(in a battery holder)1.2 Volt Led6. Which one is the best LED bulb brand among Philips and Syska?As my experience ,Philips bulb price is high ,but quality is better7. Is there enough power in a lemon battery to light a LED bulb for a science project?There is enough power to light an LED. I have even seen them power a small processor8. Why does the LED bulb outside my attached garage take several hours to turn on?Why does the LED bulb outside my attached garage take several hours to turn on?How many is "several"? If it's 24, it's broken.Does it have an internal light sensor? It may be waiting for it to get dark.Why does the LED bulb outside my attached garage take several hours to turn on?.9. What is better, a CFL or an LED bulb? What is more modern, and what consumes less power?LED's are both more modern and consumes less power. CFL's are a close second now, but they are essentially obsolete10. what is watt led bulb at 1.5v supply?Not LED or bulb able to run with 1.5V. The answer is Zero11. Can I use an LED bulb in a 3-Way fixture?That statement may simply mean that the manufacturer failed to account newer LED bulbs...A 3 way touch switch works by offering a reduced brightness level, but it uses a standard 1-brightness bulb. It achieves the cut-back in illumination by either reducing the voltage or "chopping" the wave form (this is more typical). One very cheap method of dimming a single brightness bulb is to simply skip every other 1/2 wave, as if a diode were inserted in series. But this can produce noticeable flicker and can also cause compact florescent bulbs to overheat.But to the point: The original writer asks if one can place an LED bulb into a lamp that has a 3-way touch control. The answer is: "It depends!...You must test it!" Here is the reason...First, LED lamps are typically marked dimmable or NOT dimmable. As of 2014, most screw in replacements from the major brands (CREE, GE, Philips) are dimmable, if they are "equivalent 100 watts" or less. However, they require a dimmer than chops the leading or trailing edge of the waveform. As an example, they require a more expensive wall switch dimmer than the standard incandescent dimmer ($20 as opposed to $10 for a comparable model). So part 1 of my answer is to use only an LED bulb that is marked "dimmable".But part 2 is trickier...If you purchased a lamp that says to use incandescent only, you should test it with your LED lamp. In my Hampton Bay model 494 595 upright accent lamp, one brand of LED bulb shines only at full brightness, yet produces an annoying hum at the dim step. But another LED bulb works just right, at half and full brightness. I would mention the bulb model, but they are store brands, and Home Depot is known for switching suppliers or MFG series without changing the SKU or model number. Therefore, these details would be short-lived.The bottom line, is that (a) It is likely that the touch-dimming circuit is compatible with many LED bulbs, and (b) You must still test the bulb to see if it dims. If it does (and if it does not make noise), it is very likely that the electronics in the bulb "realize" that a dimming circuit is being used, and so the bulb is cooperating by doing the dimming within its own circuitry. Therefore, you should be fine!Philip Raymond Massachusetts
Benefits of LED Car Bulbs
As the newest headlight bulbs on the market, many new vehicles are manufactured with LED (light-emitting diode) bulbs. And many drivers are upgrading their halogen and xenon HID bulbs in favour of new super-bright LEDs too.These are the three main benefits that make LEDs worth the upgrade.3 Reasons to Upgrade to LED Bulbs1. Energy Efficiency: LEDs are the most efficient bulbs for converting electricity into a lighting output. They can achieve an incredibly bright light while using much less energy than halogen or xenon HID bulbs, which is great for the environment as well as extending the lifetime of your battery.In fact, LED bulbs use 40% less energy than xenon HID bulbs and over 60% less energy than halogen bulbs. It's for this reason that LEDs can also reduce your car tax.2. Lifetime: LEDs have the longest lifetime out of all the car bulbs on the market. They can last for 11,000-20,000 miles and beyond, meaning that they may well last for the entire duration of the time you own your vehicle.Performance: Compared to other lighting technologies, LED bulbs offer the most control over the direction of light beams. This allows drivers to avoid projecting light at steep angles, meaning that other drivers won't be dazzled.Keeping LED Bulbs CoolsThough LED bulbs produce less heat than halogen bulbs and xenon HID bulbs, they are more vulnerable to heat. To control this, LEDs are designed with mini fans and heat sinks.However, some unreliable manufacturers have been known to produce low-quality LED bulbs without these features and sell them at lower prices. These bulbs cannot achieve effective heat dissipation and tend to fail due to overheating. Ensure you only buy your bulbs from a reliable supplier who only stocks car bulbs from trusted manufacturers. Read our blog post on finding the car bulbs that you need here.Replacing Your Bulbs With LEDsIf you want to upgrade your headlights to LEDs with minimal modification to your housing and circuits, your best option may be to buy a retrofit kit. These include a ballast that controls the electric power to the bulb and a cooling system with a fan and a heat sink.Alternatively, search your registration plate using our car lookup tool to see all the LED car bulbs that will fit in your vehicle.Our instructions on how to replace your car bulbs are available here.Search My Number PlateKnow What You're Looking For? Shop Car Service Parts NowAbout DIY Car Service PartsWhether you're changing your own car parts or saving costs by providing them to your local garage, DIY Car Service Parts is the ultimate site for easily identifying the vehicle parts that you need.DIY Car Service Parts isn't just about accessing car parts from the best brands at the lowest prices. With over 35 years' experience in the automotive industry, we are experts in the car parts field. Our specialist team is on hand to answer any of your queries and offer valuable advice so that you can understand more about the ways that your car works and get savvy under the bonnet·RELATED QUESTIONIn what U.S. states are HID lights illegal and why?This is a bit of a tricky question. The National High Traffic and Safety Administration (NHTSA) have found HID kits to be unsafe and illegal.You'll want to look up the law for your particular state. Here's a good resource for that:LED Car headlights and HID Car headlights by MotorFiendAs a general rule, anything over 6k will be asking for trouble with the police. I highly recommend the brand Kensun. See myKensun Hid Kit review.According toPowerbulbs.comThe seller says the kit is road legal. Is this true?Xenon HIDs are only road legal if the headlight unit is correctly E marked. If you're unsure, you're looking for an ECE R99 certification. There are only two ways for a HID kit to qualify as road legal:If the whole headlight unit is replaced with one specifically designed for HID.The existing headlight unit would have to be reassessed for compliance and then assigned a new 'E' mark.As you can imagine, this is very costly and causes a lot of hassle. However, unless you take these steps when converting halogen to HID, your vehicle will not be road legal.What if the seller says that the conversion kit will pass my MOT?The kit may pass, but that does not necessarily mean that it is road legal.Does it matter if the kit is legal or not?That completely depends on each individual driver and whether they want to risk their luck using the kit. If you find that you're asking yourself this very question, you may want to take the following points into account:Adding the kit may void your insurance and any warranty you may have on your vehicle. It's best to check this out before you buy!HID kits can pose a safety risk to the emergency services. If you're part of an accident, the kit may not switch off which could cause lots of problems. Factory-fitted bulbs are designed to switch off in the event of a collision, and many conversion kits don't have this feature.
I Had Heard the LED Lights, Which Replaced Other Lights, Are Harmful to the Eyes.How Much Truth Is i
Spanish research has shown that blue LED light can irreparably damage the cells in the eyes retina. This is not the first time energy-saving bulbs have been criticized fluorescent bulbs emit dangerous UV light. Eco-friendly LED lights may damage your eyes, according to new research. A study has discovered that exposure to LED lights can cause irreparable harm to the retina of the human eye. LED lights have been touted as a super-efficient alternative to traditional bulbs because they use up to 85 percent less energy and each bulb can last up to 10 years.In April, Philips, the worlds biggest lighting maker, reported a 38 percent jump in LED light sales from last year. A Spanish study has shown that the light emitted by LED bulbs can damage the cells in the retina. Some experts are now calling for a filter to be fitted in the bulbs (file picture).They are already widely used in mobile phones, televisions, computer screens and can also be fitted as a replacement for traditional lighting in the home. LEDs are much more expensive than traditional bulbs costing around 25 for an equivalent 100w compared to around 1 for an incandescent bulb although manufacturers claim that consumers make their money back because of the use such little energy.The government announced it was phasing out incandescent bulbs in 2007 after an EU directive banned their use. The 100w bulb was the first to go in 2009 and lower wattage bulbs continue to be phased out gradually. The ban caused public outrage as customers were forced to spend large sums of money on lighting that not only gave an unpleasantly cold light but also caused some people to report symptoms of itchy skin and headaches.The governments Enhanced Capital Allowance Scheme, which was brought in to help cut UK carbon emissions, is also pushing the use of LED lighting by offering businesses added tax relief if they use LED and other low-energy bulbs. Dr. Celia Snchez-Ramos, of Complutense University in Madrid and who led the study, explained that light from LEDs, or light-emitting diodes, comes from the short-wave, high-energy blue and violet end of the visible light spectrum. Incandescent bulbs (left) are being phased out in favor of low-energy alternatives such as CFLs (right), but there are concerns about the safety of the new generation of so-called environmentally friendly lighting. She said that prolonged, continuous exposure to this light may be enough to damage a persons retina. The retina is composed of light-sensitive tissue that is responsible for detecting light and in turn allowing us to see. This problem is going to get worse, because humans are living longer and children are using electronic devices from a young age, particularly for schoolwork, Snchez-Ramos Lighting shop owner Kerry Nicholau, from Twickenham, stockpiled 3000 incandescent bulbs after 75-watt bulbs were phased out in 2011Eyes are not designed to look directly at light they are designed to see with light, Snchez-Ramos said.Her comments are partly based on her 2012 study that was published in the journal Photochemistry and Photobiology. The study found that LED radiation caused significant damage to human retinal pigment epithelial cells in vitro. Snchez-Ramos added that modern humans have their eyes open for roughly 6,000 hours a year, and areexposed to artificial lightfor the majority of that time. Some experts have called for the LED lights to have built-in filters to cut out the blue glare. This is not the first time energy-saving lights have come under scrutiny for safety reasons. Compact fluorescent light bulbs, or CFLs, have been criticized for the high levels of mercury they contain as well as the UV radiation they can emit. LED lights have also been blamed for the changing hues of masterpieces in art galleries. A study carried out by the University of Antwerp earlier this year found that LED lights were bleaching the paint on works by Van Gogh and Czanne.This was taken from the• Related QuestionsHow do LED bulbs create light?To understand how LED bulbs work, we have to first explain what it is that a bulb of any sort is emitting.Light is a stream of photons - tiny quanta of energy; a massless particle that travels at the speed of light. When a photon hits the receptors in our eyes, we perceive that as light. Photons are emitted whenever electrons in an atom jump from one energy state to a lower energy state - the difference in energy levels becomes a photon, which is ejected at the speed of light.In an ordinary incandescent lightbulb, we cause the electrons in the material of the filament to become very agitated by forcing the material to become very hot. The electric current in the wire heats it up, making all the atoms vibrate vigorously. As the electrons in the wire are jostled around, billions of them will first acquire a higher energy state (from the electrical power supplied) and then drop to a lower one, whenever they can. Every time they do that, a photon is emitted. Most of the time, the energy state drop is small, and the photon doesnt have so much energy. This means that when considered as a wave, it has a lower frequency. Lower frequency light waves are what we call heat. 99% of the photons emitted from an incandescent lightbulb are in fact these lower frequency ones, so there is much more heat than light emitted. This is why incandescent lightbulbs are so inefficient when we consider then as light sources. Another way to look at this is that these lightbulbs are wideband light sources - the energy input ends up spread across quite a wide spectrum of frequencies, most of which are in the infra-red zone.If we could narrow the frequency band over which photons are emitted, we could make sure that much more light and much less heat was emitted. And thats what an LED does. An LED still emits photons by causing electrons to drop from a higher energy state to a lower one, but the physics of the LED is much less coarse and random than a length of heated wire.An LED consists of two pieces of semiconductor material sandwiched together. One has an excess of electrons in the crystal lattice, and the other has a shortage - the gaps where electrons should be we call holes. Since electrons carry a charge, they are attracted into the area where there are holes, which effectively carries a charge of opposite sign. This diffusion occurs until an equilibrium is reached where the pull of the charges one way and the other balance out.If we apply an external voltage across the LED, the electrons are driven further into the junction region, pushed along by the like charges coming from the power supply. Eventually, the barrier potential of the junction is overcome and a free current starts to flow. When this occurs, electrons are constantly falling into the holes on the other side, but the amount of energy they lose when they do this is quite precise. As a result, the photons emitted all have fairly similar energy, or in other words, the same frequency of emitted light. This means that the LED has a much narrower bandwidth than the incandescent bulb, and a much greater proportion of the input energy comes out as light rather than heat. Single-colour LEDs are the most efficient, because they have the narrowest bandwidth.For illumination purposes, we really want white light. White light is a mixture of many frequencies of light, so we need to broaden the spectrum out again for white LEDs. We do this by changing the crystal structure to produce light at multiple wavelengths, and in some cases use a fluorescent coating to convert higher energy photons to lower energy ones. This reduces the efficiency of white LEDs, but they are still dramatically more efficient than an incandescent bulb. However, there is still some infra-red radiation (heat) which needs to be managed, which is why LEDs with high outputs need heatsinks, to ensure that the core material from which they are made doesnt melt itself
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