Cal Kings

I am just about to purchase my first Cal king and was wondering, what types of substrate and what types of heating are best. Whether to go with the lamp so I could have the heat during the day then switch it out to the incadescent at night, so all the replies are deeply appreciated! Thanks...

i use paper towels and a heating pad.

heating pad on a thermostat

Right now my girl is on paper towels. I'll be switching her to either aspen chips or Bed-a-Beast when she gets a bit bigger