picked up a nice 8 lamp t5 & 440 cfm fan. with some jerry rigged a/c (and not enough air movement through my air cooled set up till this fan arrives) i already got the night time lab temps down down down into the 28 celcius range at 11:54 am ...easily took 3 celcius off "lights on" temps too. new centrifugal fan should do me even one celcius better. and looks like no matter how hot the weather might be ...once the lab is cool cause its a basement ...i'll be able to shut the a/c off for about 6 to 8 hours a day easy. sooooooooooooooooooooooooo happy.