Thoughts on the Reliability Testing of LED Lamps

With the rapid development of LED technology , LED has become more and more widely used in various aspects of lighting, and gradually began to occupy the dominant position in the lighting market.

As a new type of illumination source, LED has many advantages over traditional light sources. However, it still has some problems in the actual application process, which causes it to fail to meet its theoretical service life and photometric parameters. Therefore, if a high-reliability, long-life LED light source cannot be realized, even if the light efficiency is good, the high maintenance cost will inevitably limit its application in various fields. The life expectancy of incandescent lamps is generally 1000 hours, and the average life of fluorescent lamps is 10,000 hours. According to the life test of white LEDs by Narendran et al. (LRC), the life of LEDs can reach 100,000 hours.

First, the importance of reliability testing of LED lamps

The commercialization of lighting LEDs has been less than 15 years now, and technology is still evolving and improving. The manufacturers have a large difference in the level of epitaxial to chip-to-package technology, and the quality of different batches of LEDs produced by the same manufacturer is also uneven. Coupled with the design of the application and the difference in the way it is used, the life of the illuminated LED is completely less than the theoretical 100,000 hours. Therefore, improving the reliability of LED is the top priority of LED research. The study of LED reliability is the premise and basis for improving its reliability and service life. The research on the reliability of LED can not only analyze the failure mechanism of LED from the root, but also propose improvement schemes from design, process and use, and provide a comprehensive evaluation of the reliability of LED lighting products. The failure screening and product quality management provide the basis. Therefore, the research of LED reliability has very important academic value and practical value for LED research and LED industry.

The US Department of Energy (DOE) solid-state lighting 2010 technology route also regards the reliability evaluation test and accelerated life test related evaluation and testing technology of LED lighting products as important research directions in recent years, and is supported by American research institutions. Cree, Philips and other lighting giants have also invested huge manpower and material resources in research on LED reliability. China's Ministry of Industry and Information Technology, Ministry of Science and Technology, National Semiconductor Lighting Engineering Research and Development and Industry Alliance (CSA), Guangdong Science and Technology Department have also invested a lot of funds in recent years to increase support and research on the reliability of LED lighting products. Many universities, research institutes, and standards alliances have proposed plans to develop standards for LED reliability and accelerated life testing. However, due to the lack of reliable research results, various types of testing and certification are still based on LED lamps when evaluating the life of LED lamps. The normal working state ignites the point and then measures the light decay.

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