I think zandor means by saying transformer, the ballast and capacitors for the lamp (really could be called a transformer), moving those guts outside your room will drastically change the temps. I did it with my 3 ballast sets and dropped the room temp by 15deg f.
4x5 Reviewed by 4x5 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