Germ Killer Light.

The original news bulletin from the University of St Andrews  dept physics has slightly more details. And is from May 2020.

Far-UVC lamps that emit at wavelengths around 222nm may be safer because proteins in the skin efficiently absorb this light and provide a natural protective barrier.

Not that sure I'd want my outer proteins doing too much absorbing - sounds like surface tissue damage to me ! I note with some concern that these are results of a computer model of how skin ought to react to various wavelengths, not actual tests on real skin, and there is no mention of eyes, Short UV is not focussed by the eyes lens onto the retina in the way that visible light is, so the laser safety thresholds are higher for UV than for Green for example,  but even so there is a lot of work documenting cornea damage at these wavelengths. I think, given the article is nearly 2 years old,  it is probably proving to be harder in practice than it looked in theory.
Mike.

The original news bulletin from the University of St Andrews  dept physics has slightly more details. And is from May 2020.

Far-UVC lamps that emit at wavelengths around 222nm may be safer because proteins in the skin efficiently absorb this light and provide a natural protective barrier.

Not that sure I'd want my outer proteins doing too much absorbing - sounds like surface tissue damage to me ! I note with some concern that these are results of a computer model of how skin ought to react to various wavelengths, not actual tests on real skin, and there is no mention of eyes, Short UV is not focussed by the eyes lens onto the retina in the way that visible light is, so the laser safety thresholds are higher for UV than for Green for example,  but even so there is a lot of work documenting cornea damage at these wavelengths. I think, given the article is nearly 2 years old,  it is probably proving to be harder in practice than it looked in theory.
Mike.