I've got the same setup with 2 400w mh and i keep the plants about 10-16 inches away. that seems to do the trick for me. temps are at 75-85
0mn1v3il Reviewed by 0mn1v3il on . 400mh how close? anyone?how close to the tops of the girls? bare bulb in a 2x7x9 closet.1 exhaust fan and 2 inlet vents.there is a ac vent in there also but i keep it closed bcause of the exhost fan.so if zandor or mellow are 'round help a brother out please. Rating: 5