You need to run whatever heat pads and whatever lights you need to run to get the cage up to the desired temperature ranges. And this should have all been figured out BEFORE you got the lizard(s).
No one other than a couple of digital thermometers can tell you whether or not you have to turn on/off your heat pad/lights. Its not about how long heat pads or lights are on or off. Its about getting the cage to the temperatures that all the literature says it to be. How you do that is up to you.