DIY Light stand

I'm in a situation where I don't want to permanently bolt anything to my ceiling, so I'm wanting to build a stand for my 400w HPS. I'm contemplating some sort of stand that is similar to those you see over flood tables, etc. made out of pvc. I was thinking several 2x4's or maybe PVC. I have a cool tube and ventilation, so I'm thinking based on the proximity between the light and drywall/wood I've had in set ups before, I'll be fine using the wood? Would there be a fire danger if I had the right spacing and ventilation? Would it be any different using pvc? Any help or advice from someone that's done something similar is appreciated.
Thanks

sounds like a lot of work to avoid a small hole used for an eyehook. patching it afterwards would be easy.
I dont see a problem w/ wood or PVC as long as the bulb is a few inches away.
what about holes in the wall? a 2x4 between studs w/ a hole in it on each end w/ a metal pole between them like a clothes bar?

what about getting one of those wire shelves? something like http://www.custom-products.com/CustomProducts/Info.nsf/GetResource/Image_carts-Industrial/$file/Wire shelf-4-starter.jpg

and just take out the bottom shelves while sitting the light on the top shelf. It will just sit on it but since it's on a grid of metal the light can get thru while providing enough support.

that might work for ya

Go to home depot or lowe's and getting plumbing piping. Plumbing piping should run you $50-$70 for a stand made of 1/2 inch piping. It will hold serious weight