Burn Temps

[captainjack0000]

I've been reading about snake cage temps and how everybody needs to regulate them. Yup, I'm sold on that idea.

Okay, so what is the absolute maximum safe temperature measured at the glass for a UTH?

Snakes will burrow, but if you set the glass temp at say 85, the substrate level will be less than that, right?

So what is the safest at the glass?

Some places online around have said 100F. What does everybody else think?

*We're assuming this is just the hottest part, and the snake still has areas that are cooler so it can regulate itself.