Quote Originally Posted by TurboALLWD
Well, I've had my 600w hps running for a month now with the glass in place without venting. I have my 8in wind tunnel pushing 700cfm's out of the grow room constantly and the room is less than 700 so that could be why I can hold my hand on the glass without getting burned. I have two 1yr old bulbs so im not too scared about blowing a bulb. Maybe someone can convince me to pull the glass out with their past experiences but so far no problems!
My advice to most people is that if your exhaust fan runs more then 50% of the time your lights are on, then it's time to cool those lights.

Your method will work, but you lose the ability to use CO2.

I was probably not the best to answer that anyway...I haven't used an HPS bulb in a year. And speaking of a year.....don't you think it's time for a new bulb?