Yeah, 104 is a bit too toasty.
What kind of bulb?
Just use regular household incan bulbs.
Whatever the wattage your using, change it to a lower one.
Always wait about 30mins to take your first temp reading, and use a good
digital thermometer with a long wired probe.
Pretent the probe is your cham, and place it in the basking spot at the same
height as your cham (not down flush with the surface of his basking branch)
Monitor the temp at this spot for a few hours and also make a note of the room temp and RH (both have a effect on your basking temp.)
I have to change bulbs twice a year. I use 40 (sometimes only 25W) in the summer, and 60W in the winter.