We love ceremic heat emmiters over here. But I would never, ever suggest one in the cage, your snake will thank you if you are able to find a way to build a better top and utilize a ceremic exterior lighting system. Those bad boys get very hot. They are great for room size enclosures and ambient temp up keep. I really wouldn't use one inside a cage. Just get an under tank heater for now. They are cheap and very usefull.
Just my two cents
Rusty