I use theses lamp fixtures for my CHE's
https://www.amazon.com/Flukers-Repta...0114222&sr=8-2
Fluker's, has a ceramic socket and a dimmer switch on it, the 8.5" are pretty big, I use the 5.5" on 20 gallon tank screen tops
At less than 7 bucks and shipped free if you have prime, I think its a good deal
It took a while to get them dialed in, but they hold temps pretty well with just a slight adjustment now and then.
They say they work with up to 75 watt lamps
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