On top of what Jacob said, i think running at a lower power would also keep the heat source on longer to function almost like a basking set up vs running full power and power heating to the set temp and then turning off with no heat. I might be wrong but that is how i figure it. You can also just email Dion at Spyder Robotics and I'm sure he would explain it. With all that said, i just run mine at 100%.....but then again i only use flexwatt for everyone except Pat. And i have his CHE set to 84F anyways as a GTP doesnt need that hot of temps. If he didnt use the CHE after eating, i probably just wouldnt use any heat as the room stays around 77-80F anyways.