Mine have never shown any problems, and especially with the pretty ones, I do take a lot of pictures... The snakes at the stores never seem to mind it either. No scientific study to back that up though, just personal observation.
-Jen
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Albinos are more sensitive to light for obvious reasons. But other than that, I don't think bright lights or flash should be a problem for balls. However, they are probably more comfortable in a darker setting since they're nocturnal.
I am not sure if it is BAD for them, probably not. But my BP does hate flashing and bright light like that. I once took a picture with a flash of him and he got spooked and spun around and smacked his face on the side of the enclousure. So who really knows?