I'm an engineer in a datacenter. We have a company which ensures that they can save us money by swapping all of our T8 fixtures to LED fixtures.
They feature a cool white bin of a CREE Q4.
The basis of the cost savings mainly comes from labor time savings due to the complex process to change the bulbs in our fixtures. We have over 2,000 4 bulb fixtures placed above rows of servers and thousands of miles of cables.
They drive each LED at 700mA.
They are claiming we would still have 90% lumens maintenance after 10 years of operation.
For some reason, I have this memory floating around in my head of some respected members of CPF doing lumens maintenance testing of LEDs, and finding results which were much different than the 100,000hr claims given by manufactures.
I'm trying to avoid making a 3million dollar mistake if I go forward with this, and they are dim after a couple years.
I've searched Google and CPF, and CPF searches with google, and I can't seem to find anything but manufactures data on LED lifespan specs.
Was I just dreaming that I read people performing tests that indicated 10-20% output drops after a few months of operation?
Any input from folks who have insight on LED lumens maintenance testing?