Advise plz about air cooled reflectors

Greetings to all:

Any suggestions or advise is greatly appreciated. Well I just bought a 2x4x7 Dark Room tent and I'm confused on the lighting set-up. I would like to use a 400 watt HPS/MH system, but am a little concerned about heat issues.

If I use a good exhaust fan will I be ok about the heat, or should I invest in a air-cooled hood. Considering the size of the tent I only plan on 2-3 plants maybe more if they are comfortable. Thanks for the help.

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I followed a thread where the folks measured light intensity on a grid for different air cooled reflectors - the Sunlight Supply's Super Sun 2 (6" air intake, not 8") was heads and shoulders the best. I picked one up after reading their data, seeing their grids. The glass gets dusty on an Air Cooled.

http://www.growlightexpress.com/grow-light-reflectors-4/super-sun-2-reflector-43.html

http://www.bestgrowlights.com/product/SSI904300

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