75f and 64f are fine .... no temp probs there. I guessing the fan for the light is off when light off yes? I run 2 seperate cabs in same room. both have exhaust fans that are on 24/7, I run cooltubes which fans run only with light and lastly both cabs have small desktop fans for circulation. I will be installing an exhaust blower that will be venting the room as this summer will give me heat probs if I dont.