On August 7, the US Department of Energy (DOE) published a new report that passed a 18,000-hour test of the Philips Prize-winning light bulb and obtained a more realistic forecast of lumen maintenance.
The test used 200 samples at a constant temperature of 45 ° C and the spectrum was measured using a moving integrating sphere. According to the prediction when the measurement reached 7000 hours, the lumen maintenance rate of the L-Prize bulb after lighting for 25,000 hours will be 97.1%, and the probability is 95%. This value is far from required (70%).
As of July 2012, the total measurement time reached 18,000 hours. The new results are:
·The light output changes very little;
· The chromaticity is maintained well and meets the L Prize requirements;
· According to the latest data, the lumen maintenance rate after 25,000 hours of lighting will be 97.8%.
The test used 200 samples at a constant temperature of 45 ° C and the spectrum was measured using a moving integrating sphere. According to the prediction when the measurement reached 7000 hours, the lumen maintenance rate of the L-Prize bulb after lighting for 25,000 hours will be 97.1%, and the probability is 95%. This value is far from required (70%).
As of July 2012, the total measurement time reached 18,000 hours. The new results are:
·The light output changes very little;
· The chromaticity is maintained well and meets the L Prize requirements;
· According to the latest data, the lumen maintenance rate after 25,000 hours of lighting will be 97.8%.
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