[bnhaus]

Remember that you have a deep tank. The extra light is needed to reach the bottom.

A good GENERAL frame of reference in deciding how much lighting you will need for your inhabitants is a wattage-per-gallon ratio of approximately 3-5 watts per gallon, for the lower light corals and the more light-loving corals require between 5 to 8 watts per gallon*.

Please keep in mind, these numbers are purely a general starting point.

I have a 48" long tank and use 2 metal halides and PC's for Actinic.

Don't forget about the extra heat they produce.