LED

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A light-emitting diode (LED is a semiconductor diode that emits incoherent narrow-spectrum light when electrically biased in the forward direction of the p-n junction. This effect is a form of electroluminescence.

LEDs are available in various colors most notably:

  • RED
  • GREEN
  • YELLOW
  • BLUE
  • WHITE

See; http://en.wikipedia.org/wiki/Light-emitting_diode