Accelerated life testing leds on temperature and current

LED products intended for outdoor applications need specific tests to evaluate its reliability. In this paper tests for detecting failures at high temperatures and currents below maximum current rating conditions, have been carried out. Open circuit catastrophic failures have been observed in these tests at a constant current. Failure mechanisms have been analyzed. Temperature and current acceleration factors of this failure mechanism have been evaluated based on Arrhenius and Inverse Power Law Relationship.