The thing is with basking bulbs which is commonly used and sold for reptile keeping, is that it is meant for basking (Concentrated high temps while made to resist high heat to last longer -That's why basking bulbs life are shorter than a regular white light), you can get fluctuating temps throughout the day regardless of the outdoor temp. Example, I use a 50 watts bulb for my skink, who can't climb and his basking spot is about 14-16 inch away from the mesh/bulb. From the back of the lizard, the temp measures at 90F most of the day but can be 88F to 93F throughout the day. You measure the temp NOT by only the surface of the substrate, but also the surface of where your reptile will receive heat. While lamps can be a great source of heating, they need to be more controlled. Lizards don't run into this problem because they move when they are warm enough, so cool ends are important to them.
Snakes, on the other hand, as noted by reptile expert and veterinarian Dr. Mader, they are derps and would not move when it gets too hot. Naturally, snakes don't run into this problem in the wild because they would either be hiding somewhere dark and cool, hunting/moving usually in tall grass and trees where there is plenty of shade, or bask at the dawn or dusk briefly or in the shade where they feel safer than out in the open.
Again, keep a close eye out on burn injuries. They are nastier than first glance. You probably won't know the depth of the damage until days later or the vet finding them out for you. Staving off infection and providing pain relief, if available from the vet, is top priority.
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