Pretty much since the start of the COVID pandemic, Naomi Wu has been working to bring affordable high-quality far-UVC lights - deadly against pathogens, harmless to humans - to market.

I missed the product release announcement, but it’s alive! The devices output 222nm UVC for ~$150 per emitter. Each emitter is good for between 8 and 10m^3 of germicidal environment.

https://cybernightmarket.com/products/nukit-lantern-far-uvc-light