Temp on substrate vs Temp on glass

[td30]

the only problem is that ball pythons often like to burrow down into the substrate and the last thing you want is that snake to get down onto that glass. it may seem like the substrate is thick enough but i have seen balls do stranger things. better safe than sorry.

Yes, better safe than sorry. I have already turned it down, but now if he doesn't burrow down, his belly temp will be maybe 80 degrees or so on the WARM side. Isn't that too cool?