After years of development, outside led downlights have been widely used in engineering and home decoration fields, basically replacing the traditional downlights. Downlights are generally used in shopping malls, offices, factories, hospitals and other indoor lighting, easy and convenient to install for people. outside led downlights inherit all the advantages of traditional downlights outside, and heat generation is small, power saving long life, low maintenance costs.

Early outside led downlights due to the expensive LED lamp beads, the overall cost is very high, not accepted by customers. As the price of outside led downlights chips decreased and the heat dissipation technology improved, a solid foundation was laid for LED downlights to enter the commercial sector.

Outside led downlights consist of LED beads, downlight housing, and power supply. This issue will talk about the downlight's thermal performance.

The heat dissipation design of outside led downlights has a significant impact on its life, the LED heat is conducted from the beads to the internal PCB and then exported to the shell, and then the shell through convection or conduction to the air. The normal operation of the PN junction temperature can not be higher than 65 degrees, to ensure that the LED chip in the normal working temperature and will not be too high temperature too quickly produce light decay.