| Hi Christina,
I use a caliper paint to colour reflector globes, this is designed to put up with high temps, I know other use engine paint to, but I always air for a few days before puting in with the animals.
I would just ask to make sure you know what the paint is used for and if it has been used on his reptiles light guards. It will probably be ok, but your right to be cautious as some paints will have higher, more toxic fumes than others.
Neil | 
