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I'm a first time grower with a space 2FT x 3Ft and 4 Ft Tall I have a Box Fan to draw cool air in at the bottom and two small window fans to push heat out the top, my grow box has a slit 2inch wide and 3ft long across the top to vent the heat out of and 2 INCH holes in the bottom sucking air directly from outside i would like to buy a 400Watt HPS but I'm worried about heat issues should the above set up be able to handle a light that big or should i go smaller? This is the light im looking at and i have room to place the ballast outside my grow box... http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=370312769031&ssPageName=STRK:MEWAX:IT