Specifically with crocodilians... no. However I have heard of and experienced negative effects on other reptiles, specifically effecting the eyes. Black Lights (party lights) produce a lot of UVC which, after prolonged exposure can cause retinal and pupil damage resulting in damaged eyes and a loss of vision.

I imagine you want to use it for a source of night heat. I would strongly urge you not to. It would be safer to use a ceramic heat emitter or a infra-red type light.

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