What should I hang my HPS reflector / hood from?

I got my 150w HPS set in the mail from HTGSupply, and have already set everything up (even where to put the ballast), everything except where to hang it. What should I hang my HPS reflector / hood from? I have good string/chain to use to hold it up.

Is there a reason you can't hang it from the ceiling? Do you not know how to do it, or do you just not WANT to do it that way? I mean, cuz if you have the chain, why not just put some ceiling hooks in?