Introduction The widespread adoption of LED lighting technology has transformed the lighting industry, establishing LED luminaires as the preferred choice for modern illumination due to their exceptional efficiency, energy savings, and extended lifespan. However, LED lumen maintenance, a critical indicator of long-term performance and reliability, remains a focal point for assessing LED quality. LED lumen maintenance refers to the ability of an LED light source to sustain its light output over extended periods, directly influencing the luminaire’s lifespan and lighting efficacy. The LPCE-2 (LMS-9000) LED CCD Rapid Photometric and Electrical Comprehensive Testing System, developed by LISUN, is a high-precision testing instrument that plays a pivotal role in LED lumen maintenance testing. This article provides an in-depth exploration of the technical features, testing principles, application scenarios, and industry impact of the LPCE-2 (LMS-9000) system in the context of LED lumen mainte...