Ifg you want higher light corals, i recomend using VHO--- people kept telling me this, i finally broke down and went for it- got an icecap ballast and built my own light hood with a vinyl gutter-- looks great and the tank look way better. still using the other 40 watts that i started with, but just until we can buy the other 2 lights, end caps, etc. kinda on a budget- doing a little at a time.