When I am hanging a show one of the most time-consuming tasks is lighting. I change bulbs according to watt, spread, and location. I don't think most people notice other than to say "everything looks so nice". Which is exactly what I am hoping for.
Something interesting I have found is that each artist needs to lit in a certain way. Right handed painters glare in a different way than left handed, and Russian trained painters use a lot more vertical strokes, which makes very difficult to avoided glare.
Of course I am dealing mostly with plein-air pieces so the strokes stand out much more, I wonder if I would find the same in more tightly rendered pieces.