I dont know how scientific this is but in my personal experience I've noticed that brighter lights do seem to have an effect on fish's behavior. Especially in their eating habits.
I noticed a big difference every time I changed lights when I went from a regular old PC bulb, to a Nova T5 fixture, to a TEK t5 fixture.
Of course, it may have more to do with other things other that brightness (ie - kelvin, etc) but I definitely noticed that the brighter the lights the "happier" and more active the fish were.