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)
Reminds me of the Havana Syndrome event at the US and Canada Embassies in Cuba. In 2017 several people who worked there reported feeling strange symptoms from ringing ears to nausea to cognitive dysfunction. Despite several years of research and study no cause was ever found. It was also determined that it could not be caused by a yet-to-be-known weapon by a US adversary. Despite this, the Pentagon still has conducted research in the effects of long-term exposure to RF waves in animals to see if they could make the symptoms of Havana Syndrome manifest.
Except the difference here is that these are idiots who very clearly exposed themselves to UV radiation.
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.