I don't use Bulbs but I do have a CHE on my quarantine enclosure and I use a $15 dimmer from lowes and have the Probe thermometer in the enclosure. I use Herpstat 2's on my Display enclosures and yes they are expensive $195 but they regulate 2 sources. It can be a Heat mat and a Bulb/CHE/RHP ect...or if you use Radiant Heat Panels like I do i can regulate 2 enclosures
if money is slow right now grab a dimmer or a JumpStart Tstat off Amazon. Ive never used one but others have. Better than nothing. Here is a dimmer i use.
https://m.lowes.com/pd/Lutron-Creden...Dimmer/4462387