I don't think 46w is overkill, not all of that is getting into the tank. I have a ten gallon with 3 10w and one 20w screw-in U-shaped CF bulbs(50w total). They are all 6700K bulbs bought at Wal-mart. There is no reflector and the inside of the hood is painted white. I use DIY Co2 and eco-complete. The glosso in that tank stays nice and low, barely poking out of the substrate.