all I have is 88 watts on one side and 120 watts on the other, my corals are growing super fast, I have a Leaf Plate Montipora Coral that has added two inches in 5 weeks and a pink Montipora digitata that is adding new branches and growing one to two inches in the same time. I also have a t gigas that is adding a new ridge every 4 months or so currently he is 14 inches across and he sits on the bottom of the tank 26 inches down. massive amounts of light are not really needed. (I know I am going to get flamed for that one
) by the way my tank is a mixed reef 150 gallon tank.