175W MH depth question

[Chad]

Ok, I am thinking of using a 175w MH 10k or 12k over a 24" depth tank.

Anyone have any opinions on whether this will penetrate enough to provide good lighting?

Currently I will be going with zoo's , rics etc... but would like to throw in some SPS eventually. I know near the surface SPS will do fine, but what about 3/4's down?

Comments?

Thanks!

Chad