If you have a digital ballast, it's not such a big issue, as they don't generate a whole ton of heat. If you're not using a digital ballast, then get your ballast out of your room/cabinet and you will definitely see a temperature difference.
jamstigator Reviewed by jamstigator on . Cool Tube Probs ok well i made my first cool tube (400 watt hps) and it looks pretty good and it works pretty well but the temps in my grow room are going 90+. the cooltube is connected to a hard 4 in duct connected to a 250 cfm in duct fan and then a soft duct that goes out of my cab. same set up for the intake except the soft duct is the intake and the hard duct is the outtake. i also have a fart fan pointing at my balast to try to keep that cool. I also have my bubble cloner in that cab keeping the Rating: 5