A light-emitting diode (LED) is a semiconductor device that emits incoherent narrow-spectrum light. This effect is a form of electroluminescence.
The key advantages of LED-based lighting is its high efficiency and they don't generate heat.
Advantages of using LEDs are as follows, *LEDs produce more light per watt than do incandescent bulbs; this is useful in battery powered or energy-saving devices*LEDs, being solid state components, are difficult to damage with external shock* Fluorescent and incandescent bulbs are easily broken if dropped on the ground*
LEDs have an extremely long life span*
LEDs mostly fail by dimming over time, rather than the abrupt burn-out of incandescent bulbs.
LEDs light up very quickly. LED will achieve full brightness in microseconds
LEDs do not contain mercury