They do more for less. LED’s are efficient-producing a lot of light from a little power. For example, one 5-watt LED can produce more light (measured in lumens) than one standard 75-watt incandescent bulb. The 5-watt LED could do the job of the 75-watt incandescent at 1/15 of the energy consumption. LED’s save energy and, therefore, money. This is because in LED lights, 90% of energy is converted into light, while in incandescent bulbs 90% of energy goes to heat and only 10% to visible light.
They last longer. LED is virtually maintenance free – they don’t have a filament that will burn out, so they last much longer. A standard “long life” household bulb will burn for about 2,000 hours. An LED can have a useful lifespan up to 100,000 hours! By some sources, LED’s can last for as long as 40 years. Imagine not having to change a light bulb for years. There are LED products available this year that will make frequent light bulb changes so 20th century. How it actually works… (skip this part if you don’t really care) Light is a form of energy that can be released by an atom. It is made up of many small particle-like packets, called photons, which are the most basic units of light. LED’s are specially constructed to release a large number of photons outward.When an electric charge strikes the semiconductor, a small electrical current, which is measured by watts (oh! so that’s what they mean by ‘has low wattage’!) is passed through the semiconductor material. this causes the electrons to move around, become “excited” and give off photons.
Almost all of the energy emitted is light energy. In an ordinary diode, such as incandescent bulbs, the semiconductor material itself ends up absorbing a lot of the light energy so it produces more heat energy than light energy.This is completely wasted energy, unless you’re using the lamp as a heater,led street light because a huge portion of the available electricity isn’t going toward producing visible light. LED’s generate very little heat, relatively speaking. A much higher percentage of the electrical power is going directly to generating light, which cuts down on the electricity demands considerably. As you can see in the diagram,they are housed in a plastic bulb that concentrates the light in a particular direction. Most of the light from the diode bounces off the sides of the bulb, traveling on through the rounded end.
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