How Do I Run a 12 Volt DC LED Light in a 3 DC Volt Battery?

If u can afford 4nos. ,3v DC bayteries then just connect them in series u will get 12v Dc.Else if your 3V DC battery can supply enough current it may run 12v Led but u wont get desired illumination

1. Halogen, CFL & LED Light Bulbs: What's the Difference & Are They Worth It?

We are all guilty of moving into a new house or apartment and just using the bulbs already there. Afterall, how big of an impact can switching out your lights really have? Well, you may be surprised to learn that taking the few minutes to swap out your bulbs could be one of the fastest ways to cut your energy bill costs. Let's look at what makes traditional incandescent bulbs inefficient and compare the three most popular types of newer style bulbs to help you reduce your electricity consumption. With 90% of their energy given off by heat, traditional incandescent bulbs use a lot of energy to produce light, wasting electricity (and your money!) compared to more efficient, modern bulbs. In fact, according to Energy.gov, replacing your home's five most frequently used light fixtures with ENERGY STAR bulbs could save you $45 each year. Now, in the short-run, that does not seem like a lot, but over the years, it adds up. The additional environmental benefits and added convenience are just icing on the cake. Although newer forms of lighting cost more initially, these three bulbs offer greater lifetime savings- as each use less energy than traditional incandescents. Imagine the bulbs you see in older desk lamps. These lights look a lot like traditional incandescents, but there's a small modification that makes a big difference. Unlike traditional incandescent lights, halogen bulbs have a small amount of gas inside of them. This gas prevents soot build-up (think of the dark color you've seen inside of older bulbs). When the gas gets hot, a chemical reaction causes the halogen to bring any soot back to the center, rejuvenating and slowing down the destruction of the filament. Halogen lamps may also have an inner coating that reflects back heat, improving efficiency by "recycling" the otherwise wasted energy. As a result, halogen bulbs last longer and are brighter than traditional incandescents. The problem is, they only meet the federal minimum energy efficiency standard- and nowadays, there are more efficient options: like CFLs and LEDs. A compact fluorescent lamp uses about one-third the energy and lasts about 10 times longer than halogen incandescent, making CFL an instant win over the first option. In these lamps, electric current is driven through a tube and generates ultraviolet light. This stimulates an interior fluorescent coating and causes an emission of light. These are traditionally the spiral bulbs and tubes you see on ceiling fans or hard-to-reach areas, as they do not need to be changed often, and are used in many common household fixtures. CFLs are most efficient in areas where lights are on for long periods of time- think outdoor flood or spot lighting- and are often paired with protective containers to withstand outdoor weather. Let's not forget these two major perks. CFLs typically pay for themselves in less than nine months and last up to 15,000 hours, or almost two years of continual use, according to Energy.gov. As one of today's most energy-efficient bulbs, light-emitting diodes can have a life of 25,000 hours or more. That's three years of running constantly, up to 25 times longer than incandescents. It's no wonder they are used in industrial settings like traffic signals or vehicle brake lights and for TVs. They are resistance to breakage and focus light in a single direction. With other bulbs, light is reflected to the desired direction, and sometimes more than half of it never leaves the fixture. Because of this, LEDs emit little heat and waste less energy. For comparison, incandescent bulbs release 90% of their energy as heat while CFLs release about 80%. They are also one of the only bulbs that contains no mercury, which, according the Energy Department, means they leave a smaller environmental impact than incandescents and CFLs. In fact, switching to nothing but LED lights over the next two decades could save the U.S. $250 billion in energy costs and help to avoid 1,800 million metric tons of carbon emissions. There's Ways to Save- No Matter Which Lights You Choose Although LEDs are often the clear winner for their energy efficiency and cost, choosing a CFL or halogen bulb is still a major win over a traditional incandescent. Adding additional controls like timers and dimmer switches can help lower your light consumption, but if reducing costs is a priority, read our 9 Tips to Lower Your Energy Bills article for more advice. Also, consider downloading The Homeowner's Easy Electrical Toolkit. It's packed with helpful information for improving your home's safety and energy usage. Our experienced team of electricians at Southwest Florida Electric can access your home and make suggestions for choosing the best bulbs.

2. Can I use a Triac dimmer circuit to control the brightness of an AC powered LED light strip? [closed]

Certain types of LED light strings will work with AC Phase Control dimming - but most will not work.What will most likely work is the series strings of LED Christmas Lights. These are simple series strings of LEDs with sufficient series resistance to keep the current at the proper level when fed with the rated AC voltage. The strings of this type that I have seen are actually two strings connected in inverse-parallel - one string conducts on one AC half-cycle, the remaining string conducts on the other AC half-cycle.However, most LED lighting uses some form of Switch Mode power supply. Unless the power supply is specifically designed to work with AC Phase Control dimming, they most often do NOT work properly. Like the comments say - how well this will work is completely dependant on how the LED string is designed and constructed.Take one apart and see how it is built. Add your findings to your question and we can offer an opinion as to how well it might or might not work

3. I am looking to build an LED light BULB for a senior Project in School, How do I regulate the Voltage In?

Commercially, a ballast capacitor (non polar) is used in series with a current limiting resistor, in series with the full wave bridge. The capacitor is the limiting element during operation and the resistor is there to prevent voltage spikes at turn-on time. You need a polar electrolytic after the rectification to smooth things out and prevent flicker.

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