ok so I am gearing up for my new 400w 3x3x6 grow tent. so I have figured out ventilation. gonna use 6 inch carbon filter /440 cfm exhaust and 6 inch 240 cfm inline fan for intake. im gonna be sucking air through light fixture and carbon filter and out to chimney. my question now is what light fixture to use. have heard good things about the air cooled hoods in regard to staying cool through venting. have also heard cool tubes work great as well..... so what fixture do you guys think would be best for my 400w setup ???? thanks in advance