I went back to your first post & see that you did say this is a 40 gal. tank & ambient temp. is 74* so I think that's why your set-up didn't set off any "alarm bells" to me for excessive heat, but I do have to wonder what temps you're getting under that light & over your heat pad. UTH "heat pads" come in different sizes & wattages too, btw.
All heat mats really MUST be regulated, some get to 110* or more. They can also overheat (& become unsafe!) if not installed with some "breathing room" underneath the tank (assuming tank is sitting on solid furniture & not on an open-centered aquarium stand), or if the substrate is so thick inside the tank that it acts as an insulator (not allowing the heat to rise effectively as it should into the tank). There's a 'art' to setting up tanks for snakes...And it's hard for anyone to tell you exactly what you need because every room (or home) temperature & set-up is a little different from the next, & different species of snakes need different heat levels too. If your room is cooler you can also insulate 3 sides of the glass tank & partly under the bottom too. Many ways to make it all work.
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