HPS security light venting/cooling

If this wouldn't work/is stupid please tell me. This is my idea, but the construction would be a pain in the ass and I'm not sure I'm gonna do it. I bought a 150W HPS from Home Depot think I might hook it up outside/on the front of the cab. I have a real small 2' x 1.5' x 2.5' cab right now flowering a skunk with 4-42W cfl. I grew some blueberry last grow. Mmmm. From reading, I gather I could triple my yield if i hooked up that HPS. To cool it I figured I could use the reflector from one of those Wal Mart work lights over it, duck tape one end from an inline duct hose on the reflector and vent the other end outside. But I'd have to cut through some plaster board to get to the outside vent. I'm not sure the construction labor is worth the labor involved in making that baby. It gets pretty hot (86F) in there now so I'd definitely have to do something about the heat.

to me it is better to buy hps/mh than to make(mainly cause im not an electrician)
its easy to make/wire up cfls

if you use the 150 you will have to get ventilation cause that light should be hotter