How does UV light kill germs?

Over 140 years ago Downes & Blunt discovered the antibacterial effects of sunlight. They determined that shorter wavelengths of the solar spectrum were more effective at neutralizing bacteria. It is now widely known that there are substantial germicidal and anti-bacterial effects from UV-C, UV-B, and UV-A light spectrums.

Germ-killing Light Targets the DNA & RNA of Microbes

DNA & RNA is the genetic material that makes up all living organisms, controlling their growth, development, functioning and reproduction. UV light produces electromagnetic energy that can destroy the ability of microorganisms to reproduce by causing photo-chemical reactions in nucleic acids (DNA & RNA). The ultraviolet energy triggers the formation of specific thymine or cytosine dimers in DNA and uracil dimers in RNA, which causes inactivation of microbes by causing mutations and/or cell death and failure to reproduce.

Broad Spectrum of Light Optimizes Effects

Puro’s Helo and Sentry product lines, powered by Violet Defense technology, represent a significant breakthrough in germicidal protection for the world. The Puro solution uses a powerful, broad-spectrum light, including germicidal UV-C, UV-B and anti-bacterial UV-A to optimize their germ-killing efficiency.

UV-C is most traditionally referred to as germicidal UV with the ability to kill bacteria, viruses, mold, and fungus.

UV-A and UV-B light causes oxidation of proteins and lipids causing cell death.

Broad band UV lamps have also been shown to inhibit photo-reactivation, the process that can result in self-repair of damaged


We’ve packed an innovative, patented UV light technology into solutions to disinfect your spaces on demand — whether it’s protection from above or protection that follows you around. We call this Disinfection On Demand. Any Room. Any Size. Any Time.

At the heart of our products is the UV Light Engine, protected by patents from Violet Defense™. The lenses, made of a UV transmissive polymer, and are in direct and immediate contact with a Xenon lamp, the source of UV-C, UV-B and UV-A. This patented design allows significant UV energy transmission, without the fogging, cracking or discoloration that occurs over time with non-UV transmissive lens materials.

This powerful, groundbreaking design has enabled miniaturization of high intensity, broad-spectrum UV, enabling us to offer a fixture small and lightweight enough to mount in a ceiling or wall, and making it more affordable and maneuverable on our mobile units.

Learn more about our products.

Independent Lab Validation on Key Pathogens

Puro’s fixtures, powered by Violet Defense™ technology, have been independently tested by an EPA and FDA GLP-Compliant, ISO 17025 Accredited Testing Laboratory. Learn more about the importance of controlled laboratory studies for the validation of UV disinfection devices.

Clinical Summary

Clinical lab testing showed that our fixtures kill up to 99.9% of MRSA, E. coli, Salmonella, and Norovirus at distances as far away as 3 meters.


Interested in partnering with Puro™? We are always looking to build long term industry relationships that help facilities lower their risk of potential infections.


Interested in an on site Demo or our No-Risk trial program? Contact your local Puro™ representative to schedule a meeting.