Effects on LEDs during the Accelerated Ageing Test
The advancement of LED technology in the last 10 years has completely put other light technologies into the fore-ground. LED has almost entered all spheres of life. When it comes to products that use LED technology, one of the most important issues is lifetime. This paper contains a detailed overview of the research in the field of lifetime testing of LED components and products which have an LED element. Mathematical models for accelerated LED ageing tests are given in this paper. Ageing tests with constant temperature and constant current were analyzed. In this paper a simplified model of the lifetime of LEDs in products is proposed. The results of testing several samples for a product with an LED based technology are given.