that would be the way it is at night as the basking light is only on during the 14hr day cycle however the temp on the "hot side"* get to only 75 with just the UTH. The probe is on the glass with the UTH. The red light stays on all the time whenevver the temp gets below 80ish (it tends to read 77 at night)

*At night our "hot" side becomes our "cool side"