Almost as important as light, is flow. Acro's need a good flow to respirate. If you are uncertain whether you have the conditions for Acros, get a small frag and try them out. Acro's grown under MH lamps may change color under your VHO, maybe a worse color, maybe better, who knows. They may survive but brown out. That is they may turn brown, the color of their underlying zoanthelae.
Mike