Black lights are essentially long wave untraviolet rays, usually in the 345-400nm range. This is a region in what's coined the UV-A range. Occasional exposure to UV-A isn't an issue for humans or animals and is a major component of sunlight, but extended periods of exposure can weaken the human immune system and cause cataract formation. Animals such as some birds, reptiles and bees can see UV light quite well (so I wouldn't advise using it as a nighttime viewing source), but typically cannot see infrared (with the exception being those that have pits). So if you want to take a few pictures of your snakes under a black light, go for it...but it's not advised to maintain snakes under black lights.

Matt

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