I have a 400w light with a 6" air cooled reflector with a 4 inch intake fan with air coming from outside and a 6 inch exhaust fan on the light pulling air out. Its a completely closed circuit. Both of the fans are duct fans (the ones you can buy from home depot) and the 6 inch is rated at 250cfm. My room still gets super hot and its starting to piss me off because I dont know what to do about the heat anymore. If anyone could help me come up with some ideas of getting rid of the heat, that would be awesome.