And P. acnes just so happens to emit its own photosensitizer, which makes it sensitive to blue wavelengths of light. Shining blue light onto acne-prone skin can kill the bacteria and clear up
UV can be a powerful tool for killing bacteria and viruses. It is extremely effective, but should still be used in conjunction with other sanitization method
There is no way of knowing if the fluids do contain bacteria and viruses by using a black light. Dr. Eric Lee — who is a medical director of several nursing homes, works in the ER, and is a medical expert for InvigorMedical.com — tells Hunker, "I would not use a blacklight to search for bacteria, because black lights do not disclose the
Sterilizer effectiveness depends on its ability to shower the microorganism with enough UV light. Different sizes and types need different amounts of radiation to kill them. These are as follows: Organism Killing Dose of UV light (Microwatt seconds per square centimeter) Viruses: 15,000; Bacteria: 15,000 – 30,000; Algae: 22,000 – 30,000
As an innovative non-antibiotic approach, antimicrobial blue light (aBL) in the spectrum of 400–470 nm has demonstrated its intrinsic antimicrobial properties resulting from the presence of endogenous photosensitizing chromophores in pathogenic microbes.

What Is UV Light? We have been working in the visible light range from 405-470nm that kills a wide variety of bacteria including MRSA, Staph, Strep, Cdiff and more. See below (Visible Light). This is light that gets to earth and we have lights that focus on the 405-470nm range to kill bacteria. We are now getting into the UV range.

The bacteria P. aeruginosa is a fluorescent, or light-producing bacteria, that has many features which distinguish it from other kinds of bacteria. It is also able to withstand many disinfectants
GieKe.
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    • does blue light kill bacteria