I keep mine under (2) 250 DE MH Phoenix 14K on a PFO pendant and ballast's on a 10 inch deep tank. I use to keep them under a 20K XM 400w Lumenarc 20k on an M59 ballast, but the spread was not as good, on the same 10 inch deep tank. I am going back to the 400W XM 20K M59 Lumenarc but I am adding around 600w of VHO this time. So about 1000w on a 62 gallon tank. They are shallow water corals-keep that in mind
good luck with your decision!