i didn't touch the bottoms and the backs. like, put on socks, grasp box between socked feet, open box, remove the air bag packaging stuff, and if you want, UV it again. however, if you're using 185nm the ozone will get the "back" and inside. not the bottom, maybe, but if you're concerned, flip it over. If you're concerned, make sure you read research papers on exposure time of pathogens to UV-C and/or Ozone to population destruction. as i mentioned, the papers i read before i bought the bulbs said 10-60 seconds for covid. originally there was a recommendation for up to 3 minutes, but some research group went and tested shorter and shorter lengths of time. so you'd need to know the pathogen you're targeting and run it accordingly.

254 doesn't make ozone but; yes, i explained the two i have used and researched. i have not researched far-UVC. it's still germicidal, i still wouldn't want to be in the room with it. I had to check what wavelength "common" UV lasers are, and i'm guessing 261nm or so. If you aim that at your skin, it feels hot real quick. Kinda feels, to me, like my entire life i've been told that all UV is bad, but UV-A blockers are snake oil, etc.

I'll keep my eye out for more research on far-uvc and the possibility of getting a bulb to test.

oh by the way, i must have sent back 2 dozen "185nm" UVC bulbs from a dozen "manufacturers" because they didn't produce ozone, because they were fraudulent listings of 253.7nm bulbs - so this is why i was trying to steer people away from amazon and ali, as it's real easy to get the wrong type if you're looking for ozone. I've only managed to acquire 4 bulbs total in the last 5 years that produced ozone, and i burnt out two before someone said "put a fan on it, those bulbs are designed to be inside an air exchanger!"