Quote Originally Posted by Shovelhandle
you know, a little box fan can cool a pretty good size hps. I used that for 400w in a meter² area. The ambient was generally 65-70ºF. At the canopy the temp would be 80º-85º. Just an observation. good luck with the CFLs though. They can do the trick too. You know the math now.
We won't see that kind of ambient temp until December or so. We bumped the house A/C down to 76 F and run a 7 inch clip fan inside the box and have a regular box fan about 8 feet away directing more air toward the box. Right now, canopy temp is hovering around 85. We also have a 500 CFM duct fan hauling the warm air out of the top of the box.

We'll see what kind of results we get from this grow and plan to start a second grow after Xmas when we have cooler ambient temps.