Why would you use a light except to watch them, and then you would use a red light which doesn't seem to affect them, even if they even see it. You can get very low watt red "party" lights and just keep it on when you are actually observing and off all of the rest of the time. Is there any part of your house or apartment that is cooler than the rest where you could keep the crestie enclosure? I have the opposite problem, living in the frozen Northland, and I keep 50 or 75 watt halogen red bulbs over them at night which work as night lights for me. That way, even if the house temp. drops to 60F, they are about 70F if they stick around near where the bulb is.
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Terri
4:8:5 crested geckos: Popcorn, Goldfish, Harley, Bear, Big Red, Olive, Smudge, Blackie, Belle, Brilliant, Tina, Brick, Avis & Subtle, Toni(y), Kermit & Zipper