Its chip hasvarious structure, packaging and diverse ways, which can be widely used. Light efficiency is in 100 lumens/watt or more, color temperature and color rendering index can be adjusted. Life can be 20,000 hours. It does not need a very high temperature, so it is cold light source. Disadvantages: it also need to provide a stable power supply system for chip, which will increase the cost. Current LED work PN junction temperature is raised, the need for heat will increase the cost and difficulty of structural design.