I don't heat my babies at night. It has been 61 in the house in the morning these last several cold days and they are fine. They warm right up with their bulbs. I do the same thing you do with my clamp light. 60 degrees and shared work fine. Just keep your eye on the urates, if they are white then everything is ok. Mine are now shedding which is also good. They are 1.5 months old.