I'm a big fan of using UV for germicidal purposes, but I get extremely concerned when people propose using it in rooms where people are present, like the "just

I'm a big fan of using UV for germicidal purposes, but I get extremely concerned when people propose using it in rooms where people are present, like the "just put it high up in a vaulted ceiling" approach discussed in the article. People can get eye damage from halogen lamps with cracked filters in school gymnasiums[1], and those ceilings are generally higher than you'd see in most other types of room. The potential to end up deploying something that ends up being another asbestos-type "oops, we gave an entire generation cataracts and skin cancer" situation really concerns me. I'd want to see either some very long term research indicating that it didn't happen with far-UV light at all, or that the lights were in fixtures that somehow completely prevented the people below from being exposed. [1] https://www.cdc.gov/mmwr/volumes/65/wr/mm6511a4.htm https://www.cdc.gov/mmwr/volumes/65/wr/mm6511a4.htm