It's testing IES (light distribution) of the led light . The test must be in a professional dark room ,with the device “light-distribution photometer” . Such a dark room costs about 45,000 USD. With it we can test our led fixtures freely , to generate the IES test report, then we can use Dialux software to simulate the lighting effect of all application, to check the luminance , uniformity, and glare , so work out the best lighting solution for customers.
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