Far UVC excimer lamps are a relatively new technology. They use a filter to emit ultraviolet radiation at 222nm. Research is being done on 222nm wavelength light in regards to damage to human skin and eyes. One of the main concerns is other wavelengths of light emitted by far UVC excimer lamps, which may be much more damaging to humans than the 222nm wavelength.
These excimer lamps are available for purchase on their own, but are still very new. OEM manufacturers and prototype developers are the current target market for these lamps.