I started work in a factory that was 5 years old. From 6 to 8 years from new we had to replace many of the strip lighting tubes.
Looked like a bell-shaped curve to me. I wonder how the new mini floros will last. They are not doing too well for me so far, some crapped out quite early, possibly because, like strip lighting, they don't much like being switched on and off too much.

Foolstroupe may have the best idea in uplighting, because distance seems to make a difference to me. I get headaches in my workshop, with strip-lighting just above my head, but not in a factory, where it is several metres up.