Yeh, I do have a controller for the Fantech, 'had to get a special [bigger] one;like a dumbass, I wiped out one of my controllers 'cause the Fantech is rated at 3 amps, and so's the controller, but I didn't consider the surge current when the fan started, so it fried a resistor in the controller.
Anyway, I'm using the Fantech for the lights; I'll have to feather it way back probably, 'cause I'm just cooling 2 600W HID's. If I understand room circulation correctly, the smaller fan should work fine at swapping out all the air every 3 or 4 minutes; it's pulling through a charcoal filter, so that and the "plumbing" put a little more drag on the fan. But yeh, I hear 'ya about experimenting. I just don't want to end up with a hot room and all the hassle, so hopefully my investment in the fans will pay off.