what size is your leos tank?
#herpstat 2 won't come to temperature
kind mango
How far is the distance to the basking spot as well, and is there any substrate (or things like slate or stone) beneath the basking spot? Sometimes it's hard to get temperatures to retain :[
steady ether
also a 90f basking spot is too low, bump it to like 97f NQA
Bumping to 94 would do just fine fkdjfjd
edgy aspen
but i like it warm and toasty
in a 40gal at least it makes for a nice basking gradient 
steady ether
So does 96 
but 94 also can get hotter in some spots then what it is set to so 
edgy aspen
true, my herpstat is set at 97f with my halogen and the basking spot varies from low 90s to 100f depending on where you measure temps at
lean isle
the tank is a 36 x 18 x 18
no obstruction to the basking spot, it was fine before
i know 90 is too low
i set it to 95 and it went up to 87
so the herpstat saying the power was 100% is... lying
steady ether
a lot of people have struggled with dhps getting up to temps in the winter, you aren't the only one 
lean isle
this is a new issue. last winter there was no problem
it could get past 90 easily
and this just started happening a couple weeks ago
hmm. now that i think about it, the tank i had last winter was a 36 x 12 x 18, so the distance from the basking spot was a little closer. that doesn't explain why it seems to scale with the temp i set it at but still doesn't reach it??
like it was 80 at 90, i raised it to 95 and it raised to 87 like... huh?
upbeat sentinel
hmm. now that i think about it, the tank i had last winter was a 36 x 12 x 18, s...
Get a stronger bulb.
Also insulate your tank.
Glass tanks with screen tops have a hard time holding temperature because they vent heat so fast.
lean isle
i really don't think that's the solution unfortunately
deep chasm
have you tried the bulb without the stat just to see if it is maybe a faulty bulb? or a stat setup issue?