led high bay is a new star in the lighting industry in the recent years. Nowadays, led high bay not only used in the industrial and commercial lighting, it is also used in the home lighting. In the recent years, many public and industrial lighting applications are replacing their conventionallamp s with led high bay. In 2014, the LED Lighting industrial output has already reach 178 billion dollars, which has increase by 68 percent compared to the last year. Because of rapid price decline in led high bay, the world is now facing the trend of led lighting.