I voted "other". I only use it when I do a major replant, or cleaning or otherwise stir up the substrate. I find that it does indeed kill the color in my plants when it's on 24/7. I'm not sure what the reasons for this are, but I think it has a lot to do with micronutrient oxidation.
I also use excel on occasion. Excel quickly gets destroyed with the UV light...another reason not to run it 24/7.
FILSTAR Pimp #2
75 gal heavily planted,50/50 Black beauty,Eco-complete substrate, Pressurised CO2 with solenoid, ph controller, AB Reactor 1000, 330 watts 9325K GE PC lighting,Ehiem Liquidoser, 2-Filstar xp3 canisters.