A Novel Methodology for Measurements of an LED's Heat Dissipation Factor

作者：Jou R Y^*; Haung J H

来源：International Journal of Thermophysics, 2015, 36(12): 3487-3501.

DOI：10.1007/s10765-015-2003-3

• Heat dissipation factor
• Modeling
• Optical-thermal interdependence

Heat generation is an inevitable byproduct with high-power light-emitting diode (LED) lighting. The increase in junction temperature that accompanies the heat generation sharply degrades the optical output of the LED and has a significant negative influence on the reliability and durability of the LED. For these reasons, the heat dissipation factor, , is an important factor in modeling and thermal design of LED installations. In this study, a methodology is proposed and experiments are conducted to determine LED heat dissipation factors. Experiments are conducted for two different brands of LED. The average heat dissipation factor of the Edixeon LED is 0.69, and is 0.60 for the OSRAM LED. By using the developed test method and comparing the results to the calculated luminous fluxes using theoretical equations, the interdependence of optical, electrical, and thermal powers can be predicted with a reasonable accuracy. The difference between the theoretical and experimental values is less than 9 %.

• 出版日期2015-12