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the led life test new standard
2013-05-05 09:19:47
the led life test new standard
Importance of TM-21
To better understand the importance of the TM-21's, let's review the LM-79 and LM-80. LM-79 is the integrated control circuit and the heat sink LED products are electrical and photometric method, covering a total luminous flux, electrical power, efficacy, measurement of the chrominance and luminance distribution. LM-79 can calculate the initial performance of the whole lamp. LM-79 does not involve the measurement of product reliability and life. LM-80 test different temperature LED packages, arrays and modules lumen maintenance testing at least 6000 hours, Advanced every 1000 hours, it is recommended to test 10,000 hours. But even test 10,000 hours, far less than most LED products on the market claim of life. TM-21 can be relatively small test of time estimated lit long lumen maintenance dose to make up for the vacancy of an important performance testing, which is very important. However, the TM-21 test covers the LED packages, arrays and modules, and other components will also affect the lamp life, such as driving, thermal management and packaging will be more meaningful if these are taken into account. But it is undeniable that the TM-21 is a very big step forward.
The "L70/B50" can be selective alternative
There is also a newly revised LED lamp life testing proposal released soon. "Proposal" recommended the method of "L70/B50", that is measured when 50% of the light output falls below 70% of the initial value, which is the standard definition of LED lamp life. However, using standard methods to determine the value of "L70/B50" time-consuming and expensive proposal this way: the U.S. Department of Energy Lighting Facts label, you can use the lumen attenuation, warranty or accelerated test estimation life one or more of the value instead of the original "life" project.
LM-82 light engine test
Nearing completion LM-82 is also a very useful test method, the test object is a light engine. The light engine is a modular device, the LED light source, the drive and the heat sink. Light engine provides a more modular approach to lighting design. Different temperatures optical engine test results can be applied to multiple fixtures, for the entire industry to reduce the degree of complexity and cost of the test.