Yeah not too bad - a few hundred for reputable ones. Need to keep it far enough away from the filter, obviously, or risk damage over time (or just change out th

Yeah not too bad - a few hundred for reputable ones. Need to keep it far enough away from the filter, obviously, or risk damage over time (or just change out the filter more frequently). I liken using UV-C (potentially) and a good filter as a defense-in-depth technique, just like masks, social distancing, sanitizer, temp checks (all which do very little on their own, but in the aggregate help).