The LED itself is a semiconductor device, all of the semiconductor devices work has certain temperature requirements, including the environmental temperature and working temperature. Generally, semiconductor devices working environment temperature is lower than 80 degrees, when the LED internal PN junction temperature reached 140 degrees, will be invalid. Generally speaking a single LED power higher than 0.2 W, needs aluminum substrate for heat dissipation, more higher power also need increase the aluminum and aluminum heat sink. Of course this relates to the number and density of the LED, sometimes small power LED also needs to consider heat dissipation design. Incorrect heat dissipation design will directly lead to the LED life expectancy aging speed up.