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LED
Light-Emitting Diode, a solid-state device which generates light when an electric current is passed through it. Light-emitting diodes can be far more efficient than incandescent bulbs, increasing battery life and light output of bicycle lights. The first practical LEDs for bicycle lights produced red light and were used in taillights. There was an unintended and unfortunate side effect, that many bicyclists, out of convenience and because of fear from the rear would use only a taillight and no headlight. Beginning around 2005, high-efficiency white LEDs became available, LED headlights became common, and more bicyclists began using headlights. See Marty Goodman's article on the history of bicycle lighting.
