They need the heat lamp as well. So you have one double dome which you can take the coil UVB bulb out of and just use the regular incandescent 60 watt heat bulb. You can buy another dome fixture for the other one's cage. Then you just use a regular incandescent 60 watt bulb typically to get the temps you need. Not an LED bulb though. Make sure you double check that.Ok is this all they need or do they need other lights too?