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)
Havana Syndrome still effects U.S. navy personnel fairly regularly. My Dad even thought he had it for a while. I think it more related to people being at sea for sometimes a month or more without landing.