really high temps!!! Helps ASAP!! PICS

would an oscilating fan in the attic reduce the temps? inside the attic as well as the can from the contact heat?

Dude youre prolly going to have to 'open' that grow box up. How big is it? For some reason you just cant move your air out anymore than you have tried. Go to the hardware store and find some 8x10" intereior/exterior vents that have louvers you can slide open/closed and install those into the box, that will create more of an 'open' box making all air flow pretty good and passive.

If your attic is getting that hot, while the rest of your house is confortable.....then you really need to cool the attic down. Having your attic too hot is not good for the house. You really need some attic vents in the house.

http://www.airvent.com/homeowner/products/atticExhaust.shtml