yea, if the plant is to close to the bulb it will bleach em, we can agree on that
but what would be the point of filling the ceiling with lights and keeping the plants 5 feet away? You should always try to be efficient especially with lights. you want to make use of lumen intensity (not sure what light intensity is really, maybe you can fill me in on what that means exactly) and you can have to much of that. even on earth, from the sun, it's been known to happen at high altitudes (really high altitudes).
the only reason i posted here was to correct your statement. you made it like it was a simple straight fact and its not.
most people never find out about light bleaching because few people run rooms where temps are not an issue (like a sealed room). I dont wish to argue and im not going to. it's just that this site seems to be filled with these kind of partially true statements.
-Doc