What works in your house many not work in mine as far as bulb wattages go. It is a trial and error thing really. Ambient house temps are different and it also depends on if you lay the dome that houses the bulb directly on the screen or raise it up. Also, how far away your basking branch is can change the temperature drastically. If you have a temp gun, (they are cheap) you can light up some different bulbs and aim the laser on the branch where your chameleon will be basking. For me, a 60 watt house bulb works about 8 inches down to keep my temp around 90 degrees for my Panthers. For that size cage, I would also suggest multiple basking sites in different corners of the cages. Even if you don't use each light for basking, you might just want to have multiple ones to light up the cage so it's not too dark. I have even used 2 basking sites in the 24 X 24 X48. I just put a 25 watt in one of the domes so it doesn't give off too much heat.