The Flouorescent bulbs like the Reptisun and the Reptiglo do not emit any heat (well, they do but it's very slight) so there is no danger of burning your cham. That is why you can rest them on top of the cage without damage to the cage or animal.
The regular basking bulbs (Get a regular house light bulb in 40-60w...dont waste your money on the pet store basking bulbs)emit heat and light so they can burn your cham and the cage. An easy way to check, if you turn a bulb for a while and then touch it, if it burns YOU it will burn your cham as well so keep a safe distance from the cage and the cham.
Combo bulbs emit heat and light (UVB and UVA) so they can burn your animal. I use a 4ft fixture from HomeDepot with 1 4ft Retiglo bulb and 1 regular old fluorescent (I buy the grow light for my plants but you dont need it if you dont have a lot)for the second slot and that provides my UVB and UVA. MY Jacksons dont get a basking bulb but my tortoises and Panthers do. The room they are all in stays warms all winter long so the Jacksons dont need the extra heat. Jacksons arent baskers like Panthers, theyre wanderers. LOL!
Hope this helps.
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Raf
1.2 Jacksons Adults (Frank, Patty 2, Lucille)
0.0.2 Jackson's baby
1.1 Nosy Be's (Mars and Roja)
1.1 Adult Sulcattas (POOPIE and George)
0.0.2 Baby Sulcattas (frick and frack)
1.0 Home's Hingeback Tortoise (SPEEDY)
0.0.3 Red ear slider babies (Hingis, Dingis and Dorkus)
0.0.1 Gulf Coast Box Turtle (Booger Jr)
1.0 Yellow Footed Tortoise (Alfred)
1.0 Red Siberian Husky (Harley)
0.1 Black Lab (Krissy)
0.1 English Bulldog (Alice)
0.1 Blue Merle Great Dane (Wednesday)
Saltwater Fish and Inverts too