UV-C works, but...
Ultraviolet-C light kills germs, but it also ionizes molecules in our skin, leading to sunburn or even cancer. You put on your goggles and expose surfaces with the light for a minute or so, then turn it off to reduce the patient's and your own exposure.
These new lights use visible wavelengths that are harmless to us, but tuned to certain bonds vital to certain resistant bacteria. The lights can be left on non-stop, and any of those bacteria that land on an illuminated surface or float past them on the breeze are toasted. It sounds like other colors of LED can be mixed with them to give a whiter balance; I suppose the bactericidal colors could be left on dimly all night as a night light.
