inded, intense, you can have 400w or NO lights or 400w or MH, and you wotn be able to keep anything but zoos and shrooms under the NO but under the MH you could keep anything [as long as you have the proper conditions(water quality, aged, flow, fish selection, etc etc)]
PC bulbs are good for smaller tanks, while VHos are better for larger tanks (PCs dont caver as much area, and VHOs tank to lose the lgiht by the ends, this drasticlay reduces light on a little tank, but not a larger ones.
with that much PC you could keep any soft coral, some LPS, and some SPS [Montiporas(a few not all) and some deep water acros(as logn as they wernt grown in low light, most are cultures under high MH lights)
but with that much, why not just get two 250w MH pendants(unless you have the PC's already), but if you do have them allready you could get the pendants of MH with 10k (or if you want great growth, 6,500K bulbs with actinic supliments are supposed to get great growth)