Yes, I'm using a dimmer.

I have found that if I set the "at the glass" temp to something like 97, then the substrate level temp is 86 or so. It seems like about a 10 degree difference. So I need to have my glass temp closer to 92 so the substrate level will be in the low 80s.

Yeah, 92 may be too hot as an ambient air temp, but I'm also talking about placing the temp probe right on the glass. So he or she may not like the the 92F temp, and could move to cooler regions, and at least he or she won't get burned if they don't feel like moving.

For my BP, as an example, the "at the glass" temp is 98F, but she never burrows down there. The temp at the substrate level where she slithers around is always betwee 82 and 86F. It changes a bit depending on the thickness of the substrate. But, I know that if she's feeling ambitious and decides to burrow all of the way down and press herself against the bottom of the tank, even 98F should not burn her. (although, I really don't know. I've never seen a study of burn temperatures on animals)

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