Light Emitting Diode, which is conveniently called as LED lights in electronic term is a semi conductor light that emits light as soon as an electric current is applied to it. They are extensively used as indicator lights on electronic devices and also in higher power applications as in case of flashlights and area lighting. As per the technological methodology, an LED is a light source which can be infrared, visible or ultra violet. The color is determined by the composition and condition of the semi conducting material used. Discovered in the year 1907 by H.J Round, a British experimenter, earlier these bulbs were used as replacements for incandescent indicators only. The white color of the LED bulbs come from a narrow band blue that is emitted naturally by GaN LEDs. The yellow on the other hand is generated by a phosphor coating on the die which absorbs a proportion of the blue and converts it to yellow. These GaN die are able to produce operational wavelengths from green to ultraviolet by varying the relative amounts of indium and gallium during production. When electric applied in the forward direction of the device it results in a form of electro luminescence where incoherent and narrow-spectrum light is discharged from the p-n junction in a solid state material.