keeping sps will not just be about ur lightings.....u need to factor ur water quality etc.
the best option for keeping sps is by using 250watts or 400watts.....to get the best growth n color, 400watts is the way to go. but of course, the electricity bill is also a killer.
if u surf in RC, those extreme sps freaks will have atleast 1000watts in their tank.
also not to forget, u need a mature and stable tank to keep sps.