Thermal investigation of LED lighting module

This paper reports on the thermal analysis and improvement of the light emitting diode (LED) module as a lighting source. The analysis was made by transient thermal measurement and thermal simulation using the Finite Volume Method. Two basic thermal schemes were applied for the decrease of the junction temperature of the LED module. Thermal resistance was analytically defined for the LED module with multi LED packages and was confirmed by the experimental data obtained from the thermal transient method. It was found that the thermal improvement of the LED module led to the enhancement of the light output power and radiant intensity. The thermally designed LED module exhibited about 20% decrease in junction temperature compared with a basic structure before thermal design. The temperature calibrating factor, 0.046 nm/degrees C, was calculated from the peak wavelengths of the LED modules. (C) 2011 Elsevier Ltd. All rights reserved.