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Thoughts on Reliability Testing of LED Lighting(I)

May 24, 2017

 With the rapid development of LED technology, LED lighting in all aspects of the application of more and more widely, and gradually began to occupy the dominant position of the lighting market. 

LED as a new type of lighting, in many ways with traditional light can not match the advantages. However, it still has some problems in the practical application process and it does not meet its theoretical requirements for life and photometric parameters. Therefore, if you can not achieve high reliability, long life LED light source, even if the light effect even better, high maintenance costs must limit its application in various fields. Incandescent lamp life is generally 1000 hours, the average life expectancy of fluorescent lamps is 10,000 hours, and according to the United States Lighting Research Center (LRC) Narendran and others on the white LED life test, LED life can reach 100,000 hours.

First, the importance of LED lighting reliability testing

Lighting LED commercialization to now less than 15 years, technology is still developing and improving. And the manufacturers in the epitaxial to the chip to the level of packaging technology is also a big difference between the same manufacturers to produce different batches of LED quality is also uneven. Coupled with the application of product design and use of the difference, the life of LED lighting can not reach the theoretical 100,000 hours. Therefore, to improve the reliability of LED LED research is the most important. The reliability of LED research is to improve its reliability and service life of the premise and foundation. The reliability of the LED can not only study the failure mechanism of the LED from the root source, and then from the design, technology and use of improved solutions, but also the reliability of LED lighting products to provide a comprehensive assessment for the early LED Failure screening and product quality management to provide the basis, therefore, LED reliability research, whether for LED research or LED industry has a very important academic value and practical value.

The US Department of Energy (DOE) Solid State Lighting 2010 technical route will also be an important research direction for reliability testing and accelerated life testing of LED lighting products as an important research direction in recent years and supported by US research institutes. Career, Philips and other lighting giants also put huge human and material resources for LED reliability research. China's Ministry of Industry and Technology, Ministry of Science and Technology, National Semiconductor Lighting Engineering R & D and Industry Alliance (CSA), Guangdong Provincial Science and Technology Department in recent years has also invested a lot of money to increase the reliability of LED lighting products support and research. Many colleges and universities, research institutions, standards all have proposed plans to develop LED reliability and accelerated life test standards, but due to the lack of reliable research results, the current detection and certification in the assessment of LED lamps are still in accordance with LED lamp life The normal working state of the ignition, and then measure the way of light failure.

Second, LED lighting reliability and life testing of the status quo

In accordance with national standards, traditional fluorescent lamps and energy-saving lamps performance test methods have to test the 2000h light failure and 6000h life. At present CQC LED lighting products, energy-saving certification is measured 3000h, 6000h and 10000h light failure to judge the life of LED lamps; and the United States Energy Star LED lighting products for certification, the minimum requirement for light attenuation test is 6000 hours. Although these test methods can detect the actual life of the sample, but the test time is too long, the test costs are too high, can not meet the needs of the market. Because it is different from the traditional lighting technology is more mature and stable, LED technology is developing rapidly, every six months with the product chip and product shape has a great change, wait until the 6000 hours of light failure test done, this product may have been market Out, so we have to find a faster and more scientific LED lighting reliability testing methods.

If the LED lighting as a system, according to the reliability test we can divide it into three subsystems, namely the light source module (module) subsystem, drive power subsystem and interface subsystem. I believe that the current research institutions put forward the overall performance of the lamp to accelerate the test and then to predict the life of this method is not appropriate. Different systems of failure principle and acceleration principle are very different, the data is not reliable. Therefore, should be in accordance with the different subsystems to be treated separately. LED lighting power supply subsystems regardless of the traditional lighting control device comparison, or the current market and the rest of the electronic power supply compared to the technical difficulty is not high, the impact on the reliability of the light source is no traditional lighting controller so much , So in accordance with the current LED control device of the national standards and international standards to strictly test the basic can guarantee its reliability. Interface subsystem through vibration and interface plug and other tests can also ensure its reliability, the key need to study the LED light source module subsystem.

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