I understand that, but my tubs lay right over the tape, I only need my tape at around the mid to high 90s. I did as you described last night, the temperature inside the tubs got to 103 while the probe was set to 90, the probe was reading low 80s. I have my ve-100 set up to the rack and it is working fine, I'm using the herpstat to heat my lone hatchling, it's set to 90, is using 100% power. I have both set up to a dimmer switch.