.

I have 80 watts of CFL and a 250HPS in the middle.
My closet is 29" by 41". Luckily the ceiling is high up, about 4 meters, even so, I have to have the door open, fans, and let cold air into the apartment regularly. If I closed the door, I would reach 40c probably within an hour.

Interestingly, the 4 * 23w cfl's seem to raise the temp by about one degree centigrade each, so even those ones added another 4c.

.