I'm not sure why so many people have trouble with their bulbs burning out fast. I use Infrared at night and spotlight basking bulbs during the day for ambient air heat. Mine last much longer than 2 to 3 months. More like a year or more. I use Fluker's Clamp Lamps that have a built in dimmer switch so I can fine tune the light. I never hook the lights up to the Hygrotherm because it seemed pointless and severly lessens the life of the bulb by turning it on and off frequently. I keep my lights on a timer and have the lamp dialed in according to how much heat is needed. I have a UTH on the side of every enclosure and they are on constantly. The more to turn something on and off frequently the less life it will have.
My Hygrotherms only operate the foggers and tell me what the climate levels are.