hey there i could realy do with sum advice about my little grow room. its is 1 meter square and 2 meters high, i have a 4 inch fan with carbon filter, an air inlet but i am stuck on what size of light to use. i am prob gonna use 2 flood and drain hydro systems but am stuck wither to use a 400w hps light or go 4 the 600. i am worried incase the room gets to warm.............. any advice???? thanks