LLD for LEDs
TL;DR: For an LED sold today with a lifetime claim of 100,000 hours, an infallible test of lifetime and lumen maintenance would have had to have started sometime in 2001 as mentioned in this paper.
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Abstract: 00,000 hours is equivalent to 11 years, 149 days, and 16 hours. For an LED sold today with a lifetime claim of 100,000 hours, an infallible test of lifetime and lumen maintenance would have had to have started sometime in 2001. For the high-tech world of solid state electronics, that was a long, long time ago. 2001 was two years before the first BlackBerry smartphone was released. The first Apple iPhone wasn’t released until 2007. No one is at fault for not performing infallible lumen maintenance tests. They didn’t start in 2001 because the LEDs sold today did not yet exist.
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Citations
Lumen Maintenance and Light Loss Factors: Consequences of Current Design Practices for LEDs
TL;DR: In this paper, the IES recommends using an LLD of not greater than 0.70 when quantity of light is an important design consideration, which deviates from the typical practice for conventional sources of using the ratio of mean to initial lumen output and may misrep...
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Related Papers (1)
Andrew Tagg
- 09 Dec 2016