Equivalent impedance method for determining the junction temperature of LED array

LED junction temperature is an important parameter for LED performance and life. Experiment investigation of the equivalent impedance method for determining the junction temperature of single LED chip has been reported in the past. In this work, this method was expanded to any LED array. The outcome showed that the average junction temperature of any LED array had a linear relationship with the equivalent impedance, which was in agreement with experiments. Therefore, the equivalent impedance can be used to determine the LED junction temperature.