LED cooling is now more and more people attach importance to, this is because the household LED bulbs failure or life is direct and to the junction temperature, heat is not good to high junction temperature, short life of the law of temperature in accordance with Porto Vilnius reduce the life of 10 ℃ will be extended 2 times. Released from Cree, Inc. the light fades and the junction temperature diagram (Figure 1) can be seen, the junction temperature can be controlled at 65 ℃, then the light fades to 70% of the life of up to 100,000 hours! This is the life people dream, but really can be achieved? Yes, as long as to seriously deal with it the heat dissipation problem is likely to do! Unfortunately, the actual cooling of the LED lights, a far cry from this requirement! So that the life of the household LED bulbs into the main problems that affect its performance, it is necessary to be taken seriously!
To junction temperature of 25 degrees when the light-emitting 100%, then the junction temperature to rise to 60 degrees, only 90% of the amount of light emitted; junction temperature of 100 degrees down to 80%; 140 degrees, only 70%. Seen to improve heat dissipation, it is very important to control the junction temperature.
In addition to the heat of the led high bay light will be making its spectral shift; color temperature increased; forward current increases (constant power); reverse current increases; increased thermal stress; phosphor epoxy accelerated aging problems, so that the household LED bulbs heat dissipation is the most important issue in the design of the LED lamps.