OK. If you want to try to make more light, it looks like 350 watts of metal halide could cost $260, but I don't know enough about constructing metal halide fixtures to know if there are additional costs to that. But that is the cheapest way I see to get over 5 watts per gallon. Your call there. You might want to do more research and find out what you can construct, or you might want to grab the $200 lights and move the gorgon to the very highest rocks.