"High 80's is bad. Mid 80's isn't ideal, u won't reach max potential, but u will still be able to grow weed. And if i were u, I would be more worried about heat issues rather then trying to get max light on your plants. Ditch your mylar cardboard panelling crap, your plants will thank u."
I've done a little tweeking since then, learning how to use the airconditioner and placing fans in different places and now i've got the heat down to about anywhere between 79 and 85 pretty consistently, and yes i had to make kind of a whole in the top to let some of the heat exhaust through
I'm going to keep tweeking it until i can get consistently under 80 (even if i have to build a vent pipe to my airconditioner somehow)
I'll remove my panels or some of them only as a last resort.
if this were my own place rather than a rental i would put a between wall vent fan in the closet ceiling and hook up to my bathroom vent in the next room and pull the heat out that way.
with any luck i'll get my own place and be able to set up a nice little grow station that isn't my closet some day
thanks crazy horse