i am working my way up to the sps, i just got my first lps and it seams to be doing good. this is in a 33gal long though, it is only a foot deep. i think pretty much everybody is going to tell you that you need MH if you want to keep sps, but i'm eventually going to give it a shot in my tank.
i'd say if you water is good enough, and you feed good enough, and you can get them right up to the water surface directly below the light, then it's worth a shot, but that's coming from a person who hasn't tried it yet.