Here's one on fungus, good news (if you're a tomato, or tomato farmer).
Dunno how it would relate to toenail fungus, but ...??
Lett Appl Microbiol. 2014 Dec;59(6):670-6. doi: 10.1111/lam.12330. Epub 2014 Oct 20.
Antifungal effect of 405-nm light on Botrytis cinerea.
Antifungal effect of 405-nm...