Validation of the methodology of lumen depreciation acceleration of LED lighting

The 2-stage acceleration theory based accelerated lumen depreciation test method for LED lamps/luminaires was released recently as a standard-CSA020, which can reduce the lifetime test from 6,000 hours to less than 2,000 hours. However, to perform as a methodology in the application of that method, still some concerns existed. This paper validated that methodology by experimentally investigation on those major concerns. Results show recent lumen measurement system can meet the measurement error requirement and the criterion setting for over temperature protection function triggering in CSA020 can work. Probably the improvement of chamber´s design to meet the requirement of temperature acceleration in CSA020 is in need.