The Full form of LED is Light Emitting Diode. LED is a two-lead semiconductor light source. It is a pn-junction diode which emits light when activated. Now a days, it is a very important electronic device because it is used in a lot of electrical and electronic devices like electronic test equipments, TV’s, calculators, watches, radios, etc. LED is proved to be a revolutionary product in the field of light source as its lamps are very energy efficient, economical and long lasting. It is almost 80% energy efficient as compared to conventional lighting bulbs and fluorescent light sources. The benefits of LED can be elaborated as: 1. Energy efficient – LED requires very less power. For example, LED TVs are more energy efficient than LCD and CRT TVs. LED does not produce heat, so it reduces the cooling loads also. 2. Environment Friendly – LED lights does not contain mercury, lead or cadmium, so they are non-toxic. The enhanced use of LED lights can reduce carbon emission. 3. Better Picture Quality – If compared to conventional lamps and lights, LED offers better image quality. LEDs have allowed video displays, new text and sensors to be developed. Due to their high switching rates, it can be also useful in advanced communication technology.