the red light is theyre during the day basking light, its a proper heat light
Mike - You will find that a Phillips brand Spotlight from your local supermarket or hardware store will do an identical job for about 1/10th of the price - I often get bulk packs from Bunnings for even cheaper...will save you a fortune in the long run...
I also agree with Tristis re: making a stack out of plywood - they are simple to construct and do not pose a threat to the animal. You would not believe the weight those little guys can move when they try - plenty enough to topple a few large stones...