It sounds like, and forgive me if I misunderstood, that the only heating you were using prior to the lamp was a UTH. UTHs are not for increasing ambient temps which is obviously what you're having some issues with. You're going to need some kind of overhead heat source to help with that, and whatever you use, whether it be the lamp you have, a CHE, or a RHP, you're going to want to hook it up to a thermostat to control the temperature. It's dangerous to run any kind of heat source without a thermostat, so regardless of what you go with, make sure you pick one of those up as well.
A thermostat is going to turn that lamp off once your temperature reaches whatever you set it to. A CHE hooked to a thermostat worked fantastic for me for ambient temps, but living in Georgia I had some humidity issues that I had to correct by making some DIY alterations to my enclosure.
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