4. High price is one of the obstacles for application promotion. Government subsidy alone is not a good policy for long term development. Replacing incandescent light with LED can have outstanding energy-saving effect and additional subsidy, but for customers, energy-saving light like straight tube fluorescent light is more balanced in saving energy and prices.5. Another issue for led high bay is lacking a stable and ordered industrial development trend. Thousands of enterprises flooded into the middle and downstream LED Lights industry in a couple of years. Some of the SMEs are simply copying with low level, and they exaggerate the products using low quality material. Price war has been a tumor in the industry.