Just to add, when I did some research on excimer lamps last week, producers are few, and the research I discovered were sometimes using the 253nm lamps, but add

Just to add, when I did some research on excimer lamps last week, producers are few, and the research I discovered were sometimes using the 253nm lamps, but adding filters to get to the 210-220nm range. It quite confusing, to say the least. Edit: Indeed the article linked above is one such study:"We used a bank of three excimer lamps containing a Kr-Cl gas mixture that predominantly emits at 222 nm25,26. The exit window of each lamp was covered with a custom bandpass filter designed to remove all but the dominant emission wavelength as previously described15. Each bandpass filter (Omega Optical, Brattleboro, VT) had a center wavelength of 222 nm and a full width at half maximum (FWHM) of 25 nm and enables >20% transmission at 222 nm."