Different questions of today's LED thermal testing procedures

Our goal is to provide an overview of a few theoretical and practical issues of current LED testing standards and recommendations that we encountered during round-robin testing of five different types of power LEDs during our work in the frames of the Delphi4LED project. We focus on the JEDEC JESD51-14 and the JESD51-51 standards that have been commonly applied for LED thermal testing since these standards were published. CIE has also published their new technical report on optical testing of high power LEDs with a special attention paid to setting the LEDs' junction temperature for the measurements. An enhanced testing method is also presented to combine the benefits of both JEDEC and CIE documents. Conclusions are based on our own findings during the above mentioned round-robin testing that could serve as a basis for a high-speed hybrid LED testing technique.