Just a quick very stupid question. My 4x8' tent and 1kw hps cooltube are running a bit too cool. I picked up a Speedster controller, as long as the tent sucks in on iteself there is enough neg pressure? Thought process here is simply, slow down the exhaust to slow down the passive intake therefore increasing heat a little, or would it be best to control the fan on the light? Both fans are 6" 440cfm vortex's. Thank you kindly for your time. , the site is awesome
Control your exhaust fan not your intake. Tent sucking in on itself does mean negative pressure, but no way to judge if its "enough".