> "...led them to conclude that at the current OSHA regulatory standard for continuous 222 nm light exposure that you would see 90% viral inactivation at 8 minu

> "...led them to conclude that at the current OSHA regulatory standard for continuous 222 nm light exposure that you would see 90% viral inactivation at 8 minutes and 99% inactivation in about 16 minutes." Something I learnt about disinfection protocols is that they're measured on a logarithmic scale, much like volume (decibels), earthquakes, etc... So when you see marketing saying things like "kills 99.9% of germs", think of that as "strength 3" because it has three nines. The article mentions strengths from 1 to 2, which is about as low as it gets and still have "some" effect. Hospital grade disinfectants are more like 99.99% to 99.999% ("4" and "5" strength), for comparison. Autoclaves and the like can go to "12"! This is because bacteria grow exponentially, so to remove "one doubling" time, you have to halve the numbers. To remove "two doublings", you have to quarter the numbers, and so forth. In other words, every unit of safety time you want to buy requires an exponential increase in disinfection. Keep this in mind when shopping for cleaning products! The difference between "99%" and "99.9%" is just "one" doubling time, not a tenfold improvement. More reading: https://static1.squarespace.com/static/5f42a255876c3361a618915f/t/5f43f1f70d9032798d274ccb/1598288376242/Science-of-Sterilization-Article.pdf https://static1.squarespace.com/static/5f42a255876c3361a6189...