Advantages include:

  • High efficiency – LEDs are now available that reliably offer over 100 lumens from a one-watt device, or much higher outputs at higher drive currents
  • Small size – provides design flexibility, arranged in rows, rings, clusters, or individual points
  • High durability – no filament or tube to break
  • Life span – in properly engineered lamps, LEDs can last 50,000 – 60,000 hours
  • Full dimmability – unlike fluorescent lamps, LEDs can be dimmed using pulse-width modulation (PWM – turning the light on and off very quickly at varying intervals). This also allows full color mixing in lamps with LEDs of different colors.[1]
  • Mercury-free – unlike fluorescent and most HID technologies, LEDs contain no hazardous mercury or halogen gases

http://en.wikipedia.org/wiki/LED_lamp

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