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What is an LED? LED stands for light-emitting diode (LED) and is a semiconductor light source. The LED is based on the semiconductor diode. When a diode is forward biased (switched on), electrons are able to recombine with holes within the device, releasing energy in the form of photons. This effect is called electroluminescence and the color of the light is determined by the energy gap of the semiconductor.
Where have they been used? Introduced as a practical electronic component in 1962, LEDs are used for aviation lighting, automotive lighting, traffic signals, personal electronic devices, televisions, and lighting.
Are they a good choice for lighting? - LED's make a great choice for lighting due to their long life and exceptional brightness characteristics. LED's last from 50,000 to 100,000 hrs of use making them 4 to 5x better than most traditional light sources. While producing equal amounts of light they can reduce energy consumption by 65 to 85%
What other features do LEDs have that make them great light choices? 
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