Quote Originally Posted by BlueBear
This is what I always preach, good topic. I have my 400 about 4 inches away from the little ones in veg with an air cooled and with the air cooled on the 1000W I go about 10 inches, I could go closer, but I don't want to loos the ft print and I have noticed that some plants can't handle the lumen intensity and the chlorophyll in the bud will become bleached and turn white.
Adieu
bluebear i love that name,not to get off the subject,but how are able get that bulb so cool.can u tell what Ur grow area and ur fan cfm's because i a small grow cab and i get under 87 constantly. the cab is only 60'' height,15 deep and 29 wide ,so roughly 3.3 sq ft and im running a 400w hps home cool tube with that 80 cfm in-line duct fan.I have it pushing thru the cool tube and out the other side. im trying cool the bulb and exhaust it at the same time and also I have a 80cfm for the intake and 240 i believe for cab exhaust three fan what am i doing wrong.