Some companies sell UV rays with ozone formation options that also kill bacteria.
Ozone-producing tubes are actually cheaper. To stop ozone production, you need to filter wavelengths below 240 nm.
This makes ozone-free tubes more expensive. Although ozone is germicidal, it is harmful to our health. You have to recycle the air. It takes 45 minutes to remove ozone from a room. Our UVC system is germicidal, and does not emit any ozone.