This actually makes sense and mimics the results I got doing experiments with flashed high-intensity UVC for sterilizing surfaces a few years back. You don't re

This actually makes sense and mimics the results I got doing experiments with flashed high-intensity UVC for sterilizing surfaces a few years back. You don't really need to leave UVC going for a couple of minutes. Two high-intensity pulses similar to what a camera flash would do for an exposure does the trick, assuming you put enough power per square millimeter down on the surface. Obviously I wouldn't try that on important living tissues, but microorganisms certainly don't survive what amounts to a photonic nuclear blast.