LED Lights gives light by electron transitions through energy band. It doesn’t contain infrared ray in the spectrum. The heat of LED cannot be radiated, therefore LED is called cold light source. LED is often encapsulated using epoxy which is poor in heat conduction, and heat is conducted through pin substrate beneath the chip. Traditional LED is of lower power and less heat, therefore there was no worrying about heat dissipation. However powerful led high bay for lighting is composed by many LEDs to reach the luminous flux, and the LED chip is quite condensed which can generate a certain amount of heat. If the heat is not conducted appropriately, it will affect the performance of chip directly.