I have two AP T8's with the 18" fluorescent bulbs, and I want to replace the regular tube with a black light tube (looks better, not as bright, etc.) I don't plan on leaving it on overnight (maybe an hour or two most if it is agreed upon that it is not harmful), just for when people want to see the cages and such but I don't want to put it in if it will be harmful to the snakes eyes/ruin the sleep schedule and all that. Anyone have any thoughts?