gotcha yea i will be buying a air cooled hood with 6" air openings on both ends so i will hook my 125watt fan with 440cfm righton one of the opeingings that should get rid of most of the heat i think cause thats alot of air being put though right? and ill buy a hydro hut so i will need the ventilation so the 600hps with 250 or 175mh is what i will with i think lol...and ill do 4 or 6 plants soundin good? thanks again all