I saw those too at home depot when I was first starting out. I thought about it but was too lazy to want to wire it up, and then rig it up in my closet. If they could make lower wattage HPS bulbs that are self ballasted and screw into normal sockets, I'd be all over that. I'm trying out LED's now, because one of my main concerns is keeping power usage down. Some day I'll get my hands on an HPS and give it a go.
When I saw this as a sticky I felt like I won the lotto. Thanks!
