Thermal and optical properties of power LEDs

With the increased efficiency of high power LED, the thermal design of the device used LEDs become more important. In this paper, four kinds of white power LEDs were selected, and the aim of this study was to compare the thermal and optical properties of the white power LEDs from different LED vendors, and to find LEDs with the optimal properties. Moreover, each group of LEDs was made into bulbs of different watts, respectively. The characteristics of these bulbs are also tested, and the relationship between the temperature and the luminous efficiency is obtained.