I use an infared heat lamp and a heat pad. The heat lamp leave a 90-95 degree basking area (also where the warm hide is) and leave the rest of the tank at about 80 degrees. The only times that I have used the heat pad is during the winter months when the heat lamp can't keep up (left the cool side around 70 degrees = not acceptable)

The infared lamp stays on all the time, and I see Amber out at night all the time. The light doesn't seem to bother her sleep cycle one bit.