LED can make things look off-colored too, so check out under normal lighting before assuming anything under your grow lights. MAybe, next time you remove a shielded or one with symptoms etc.. i.e. expendable, that's easier than moving an entire plant as long as some portion of the leaf looks like the rest of the plant.
if you see hint of fading, i'd let it play out a bit, if slowly proceding. Better to be sure. Othwerwise, if the plant is vigorous, i wouldn't worry too much.