Razz is correct ,
Rhizome has a good thread somewhere on here that addresses this issue and many others inteligently w/ equations / facts . Image Reaper grows w/ a 400 hps and might be a lil help to you also .

I'd use a cooltube and pull the hot air from cabinet and light both through it and lotsa passive intake air , about 250 - 300 cfm would be nice as long as your not gonna try to use a scrubber w/ it too .

Peace
Crispi :jointsmile: