Light Emitting Diode (LED)

A Light-Emitting Diode is a semi-conductor based form of Electroluminescence. It is built by taking a 'silicon wafer' (a thin slice of
pure silicon) and adding special materials to parts of the silicon using a process called "doping". This changes the electrical
This1 properties of the silicon and current can flow in one direction only. Other materials are then added to this wafer of silicon
to make it produce light when a current is passed. By addition of differnt materials, LED's can be made to produce light of
colours in the visibile light spectrum and also light in the ultraviolet and infrared spectrum.

LED Advantages
1.Energy Efficient
2.Longer life span
3.Environment friendly
4.Durable

Energy Efficiency

LED lights produces less heat comparing to other traditional lights. LED is known to reach 80-90% efficiency this means larger
amount of electricity is use to produce light than heat. Incandescent bulb produces 90% of heat energy and remaining 10% is
use to produce light. Same as CFL bulbs which produces 30-35% heat and remaining to produce light energy.

This means a 60 watts incandescent bulb can be replace by 15-18 watts CFL and also equivalent to a 6 watts LED bulb.
LED uses less power to produce same brightness due to its power efficiency.