It’s likely because some light fixtures that emit a ton of UV light also look “cool” and get used in the wrong setting. They’re supposed to be for stuff like disinfection. Looks like the bulbs outlining the dj both could be the issue. It wouldn’t be any of the professional fixtures. (Pic in comments because I don’t think you can upload an image in this community for the main post)
Did Marina Abramović hurt her eyes in that show?
She used very low power UV lamps to evoke the emotional responses she got from folks. But they were only directed at the participant.