Hey,Sheldon-
I grow in a similar sized space (2x2x44") with an (allegedly) 1000 watt LED (200watts at the wall)
I use 2 4"usb fans-1 at the bottom pushing cool air in,and 1 at the top pulling air out...before I added the bottom intake fan,the box was running 15 degrees above ambient,added the intake fan and the temps
in there dropped to 8 degrees above ambient.
Your thermometer placement will also affect the readings you get....is your thermometer,or it's probe, down at the plant level,or up top by the light-there's a big difference in the readings you'll get,and we don't really care what the temp is "up there" by the light...down at plant level is what we need to watch...
Just throwing that out there...
