Lamp Thermostat ?

[The Serpent Merchant]

http://www.reptilebasics.com/thermos...onics-ve-200d/
This is a dimming thermostat. I have not used it. I have used this website for other items and am pleased.

That is the same type of thermostat that I am talking about, a proportional dimming thermostat.

- - - Updated - - -

OK, so the Rheostat isn't going to dim the lights when it hits a certain temp? I would still have to do this manually and just try to adjust to keep the ambient where I want it?

Yes a rheostat is a manual device whereas a thermostat is an automated device. If the room your cage is in stays about the same temperature most of the time a rheostat will be much cheaper and be just as effective. But if your room temperatures change often you are going to have to moniter cage temperatures and adjust the rheostat. I personally prefer an automated system that regulates itself. That's why I use and reccommend thermostats.