I too recommend a cool tube, $80 ebay, reflector and tube only.

I got my 1k hps cool tube ballast and reflector for under $200

They are super effective. I mine in a 3'w x 3'd x 6'h room, inline 6" turned way down and temps no higher than 70 degrees. I used to run the cool tubes just with just one $40 duct booster that I got on ebay and it never got over 75 degrees.

I fought heat problems with other air cooled hoods for years. If you spend any money to air cool something go with the tube and save headache after headache.

Just my .02