pimps gone for the week ....guess he thought he desirved a vacation,lol - -whatever fixture you get the amount of light varys from fish {don't really need a specific amount of light, flouresents will work fine] to soft corals, polips, shrooms etc at 3-5 watts per gallon. to Lps corals, or hard corals, clams etc etc -now your getting into the 5-8 + watts per gallon - - ive also heard that depth of water is critical as well - - 12-15 inches of water is the base number on light - - the deeper you go the more watts you need to penetrate ...hence the reason for intense metal halide fixtures . . .i guess we would need your tank depth and what type of corals you are shooting for to get a closer number and recomendation for you.
http://www.wetwebmedia.com/
excelent site for information on all kinds of corals, lighting etc etc
snowboss