I see that UV-C is the best to kill bacteria generally. We are interested in using to kill off odor in shoes.

What illuminance is needed to kill most bacteria with UV-C?


  • 1
    $\begingroup$ Welcome to Biology.SE. Only the last of the three questions relates to biology. The others are questions of material physics. $\endgroup$
    – Remi.b
    Aug 3, 2016 at 22:47
  • $\begingroup$ Do people still use the foot-candle in the USA? The standard unit of illuminance is the lux. Note that once you know the illuminance on the target, finding out the illuminance at a given distance is quite basic (and is a question of physics/math). I would recommend you restrict your whole question to something like "What illuminance is needed to kill most bacteria with UV-C?". $\endgroup$
    – Remi.b
    Aug 3, 2016 at 22:49
  • $\begingroup$ Close vote retracted and +1. $\endgroup$
    – Remi.b
    Aug 4, 2016 at 15:25

1 Answer 1


The wavelength of UV-C most effective at provoking mutagenesis in DNA is 260 nm, which has been shown to kill Cryptosporidium parvum at doses below 10 mJ/sq cm.


In units of lux, 10^5 lux of sunlight has been shown to kill 99.9% of Aeromonas salmonicida after two hours of exposure.



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