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Light-emitting diode (LED)

“Bulbs - never again!”

A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices, and are increasingly used for lighting.

Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet and infrared wavelengths, with very high brightness.

(Source: Wikipedia)

Read more: http://en.wikipedia.org/wiki/LED