Hum, hard to say, Ive seen them under that lighting, I have a very nice large frag under 440 watts of VHO mix of 50/50's and actinics and 130watts of PC's duel daylight
I would worry more about water quality than lighting
Water needs to be very clean for SPS esspecially acros of any kind
Skim good, do wc's and keep Phosphates under .05... the lower the better, and keep nitrates 0 to VERY VERY low as in, maybe 2ppm
Keep everything stable too, stable Ca and stable Alk and stable pH
Clean Water, Stable Water and Good lighting and youll have a prized tort.