Its been pretty hot where I'm at, so the temps outside along with my small cab space are the culprit I think. Im using a area 20 inches deep, 26 inches wide and 54 inches tall. Its small but good enough for just 3 I want to grow. I had 4 23w cfls in with the PG260 to start but when closed temps were up over 35c. I have a 80cfm fan blowin hot air out but its a booster and in reality only pushes half that at best. So i took out all the cfls and keep it open when on and temps are about 26-29c, outside been a steady 28-30c. I got a 6" inline 400cfm with speed adjuster on the way, hopefully I can control the temps then and put the cfls back. Got the larger fan cause Im testin the LED this round, if all goes well I'm gonna get a nice size tent and another PG.
One thing i found interesting though, is looking around the web nobody seems to have given the PG260 a run on its own, I was curious to how it performed by itself.