On August 7,DOE has released a new report to announce Philips L Prize LED Bulb passed 18000 hours test.And from the test,DOE also gets a piece of more true prediction material on lumen maintenance ratio.
200 samples are tested.The test is under the constant temperature of 45°C,and uses mobile integral ball to measure spectrum.According to the test data which is watched at 7000 hours,the lumens maintenance ratio of L-Prize light bulb will be 97.1%,when it lights by 25000 hours.And the possibility reaches 95%,exceed general requirement(70%).
Until July 2012,its total measuring time reaches 18000 hours.The new results as following:
The changes of light output are minimal;
Delivers a chromaticity change of less than 0.004 relative to the CIE 1976 color space
According to the latest data predict,the Philips lamp will deliver 97.1%lumen maintenance at 25,000 hours.
Source:
http://www.ledinside.com/news/2012/8/philip_l_prize_led_passed_doe_test_20120810
