Application Research on Illuminance Maintenance Method as a Substitute for Lumen Maintenance Method in LED Flat Panel Light

With the continuous advancement of LED flat panel lights in various fields such as office lighting, classroom lighting, and commercial lighting, the requirements for reliability testing of LED flat panel lights are constantly increasing. Among them, the lifespan detection of LED flat panel lights, as one of the most critical items in reliability testing, has attracted increasing attention. This paper proposes an average illuminance maintenance method to predict the lifespan of LED flat panel lights instead of the lumen maintenance method. The method utilizes a brightness uniformity test point layout to calculate the effective lifespan of LED flat panel lights. Finally, the reliability of the results obtained by the average illuminance maintenance method is verified through t-tests. The lumen maintenance method calculates the effective lifespan of LED flat panel lights as 54,600 hours, exceeding 50,000 hours. The result of the average illuminance maintenance method, based on brightness uniformity test points, is 52,399 hours, with a 99.95% probability of exceeding 50,000 hours.