Reseach On Lifetime And Photoelectric Properties Of High-power White LED Lamps

In recent years, LED lighting industry had developed rapidly at home and abroad, but with LED lamps supporting the testing and measurement technology standards is still not perfect. LED performance parameters, especially effective indicators to be studied life indicators. In this paper, we have studied the international standard for LED lighting, analyze the factors affecting the life of LED lamps and related optical and electrical properties of lamp life, focusing on the treatment of accelerated life test fixtures and related data. The main contents and work in the following three aspects.First, LED lifetime measurements are commonly used IES LM-80 and TM-21 standard. However,this is only two standard methods for measuring the LED light source, measurement methods and the corresponding LED lamps is no standard, which is due to the structural complexity and diversity of LED lamps, which comprises a light source, power supply, heat dissipation structure, the optical structure, and other mechanical components. Based on the characteristics of LED lamps and IES corresponding measurement computing standards in engineering on the basis of the reliability of LED lamp life for analysis. Life LED lamps contain standard photometric and colorimetric changes both attenuation, attenuation used for photometric Arrhenius model and the corresponding measurement methods, which have corresponding provisions in the IES and other standards. For color change is mainly prescribed International Lighting Association(CIE) sta ndards. For standard lamp life of the current market is mainly luminosity decay parameter, while for lower chroma concern, the paper color photometric measurements comparing the two parameters were analyzed to develop appropriate life test program.Second, for the current LED lighting standards and measurement methods, this article uses a company 3W white bulb for instance LED lamps overall energy efficiency and lifetime analysis, the experiment was carried out to improve the relevant standard test methods of measurement basis lamps on, for Common methods of measurement reliability Arrhenius model for LED lamps 35 ℃, 55 ℃, 85 ℃ incubator for long-term accelerated life test at different temperatures and for long-term data collection. For colorimetric analysis of experimental data, we found that LED lighting LED lighting color at ambient 35 ℃, 55 ℃ chromaticity change minimal but at 85 ℃ conditions change rapidly, color change lighting performance for the course color coordinate shifts to happen a lot of the blue area, by spectral analysis indicated that the LED lamps reduce the percentage of yellow in the accelerated life process, which is caused due to failure of the phosphor, and the change in spectral analysis yellow spectral wavelengths for We find a lamp color evaluation methods related life. Also in the course of the lamp color index rose color tolerances from large to small and then larger.Third, the collected data is analyzed and calculated activation energy of this kind of lamps infer its life under different conditions. For lighting color retention in terms of proposed experiments and color retention calculation and evaluation methods. For lighting experiments had long accelerated life test and measure the overall experiment and experimental phenomena found in and make the relevant inference, made their new measurement program, and gradually improve the measurement program and the corresponding increase or decrease the measurement time, thus providing new evidence and ideas for the LED lamp life measure ment standards. Through the life of the experimental data on the lamp photometric and colorimetric analysis to find easier and more convenient time-saving test methods of time.