I'm looking for a light for my 75 gallon, i saw a few on ebay that are 48" and 260 watts, i dont need that much wattage, but i do need that size, or do i? can i use a light that is small then my tank? like a 36" one? ive been looking on aquariumguys.com too and they have a large selection, i like the current sattelite which is 48" and 260 watts because it also has the built in lunar lights, anyone have any suggestions, i wouldnt mind using a light of like 36" as long as it would work what do you guys think?