As soon as i put a Zoo-Med Power sun 100 watt over his basking spot in place of the 125 watt Exo Terra SolarGlo , he went from going to sleep at 1-3 pm every day , to staying up all day until the lights go out . He starting doing the very next day after i switched bulbs . A+ for the ZooMed PowerSun . BUT it better be good ,it was almost twice the price .