Well i just got the HPS pretty much ready for the install later. (put it on floor just for example).
As you can see size is an issue, a possibly heat. I have no room for a cool tube, but hopefully this fan will keep air moving over it, and the hot air will get blown away into the exhaust. If not i will cut a hole into the reflector and route it too the exhaust.
The Reflector is a sign i got at the local hardware store, works great, and cost 2$ I painted the other side flat white
My little guys are starting to smell, and it smells great.