LED is English LightEmittingDiode or light emitting diode is a semiconductor device, it is used as luminescent materials when the two ends with forward voltage carriers in semiconductor compound induced photon emission light is generated using the solid semiconductor chip. LED can directly emit red, yellow, blue, green, green, orange, purple, white light. The first commercial diodes in 1960. Its basic structure is an electroluminescent semiconductor material in the light on a wire rack and then sealed with epoxy resin around to protect internal core wire so the seismic performance of LED.