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Rule of thumb in powering LEDs-prioritizing longevity over light output.
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Ice-Tea:
If you keep the driver out of the equation: derating for the LEDs on its own means very little, its the temperature that's the killer. Derating it to 25% but having piss poor cooling will probably see it fade a few years anyway. Properly heatsinked LEDs can last a *very* long time, even when running them at full spec.
metrologist:

--- Quote from: Ice-Tea on October 31, 2018, 07:04:47 pm ---Properly heatsinked LEDs can last a *very* long time, even when running them at full spec.

--- End quote ---

Yeah, nobody want's that. No profit.
tpowell1830:
Big Clive reviews and tears down a lot of LED lights. If you don't watch Big Clive's videos, I have attached a link to his channel.

https://www.youtube.com/user/bigclivedotcom/videos

Hope this helps...
texaspyro:
The standard for LED lamp longevity is a decrease to 70% of rated output.   I have a few bulbs that have been on 24/7/365 for over 10 years with no discernible drop in light output.   I did measure one PAR20 bulb in my integrating sphere after 5 years and it's output actually increased a few percent.  I just tried to check it again last week, but the ink that I wrote the value on had evaporated...
Crazy_Pete:
Hahaha i came home to what fortunately had a glass table underneath it.   A mentally disabled fellow (not being funny, his mother suffered a wartime injury as an innocent civilian victim while pregnant) who is associated with our co-op decided to be helpful and put 50W Halogen Lamps in a light circuit rated MAX 10 watts for LEDs.     I came home to a terrible smell and various light parts, burnt melted plastic and other charred bits from the Ceiling all lying on the large Glass Dining Table.   Had this stuff fallen on the hardwood floor it might have been a real problem.  Point is always run cooler if you can and fer Pete's Sake (pun intended)  SAFETY FIRST!  :-)

Thanks,

Crazy Pete
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