Using UV to kill bacteria in shoes
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.

http://www.ncbi.nlm.nih.gov/pubmed/12834745

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

http://www.sciencedirect.com/science/article/pii/S0043135499001591