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What is UV-C light?

“What is UV-C light and how does it work?” We'd like to show you! The complex science is as simple as exposure to light.

 

As you can see in the image below, the sun emits radiation right across the electromagnetic spectrum1. Earth’s atmosphere filters the sunlight; long-wave (UV-A) and middle-wave (UV-B) reach the surface of the planet, while short-wave (UV-C) get absorbed. All UV-C light on Earth comes from artificial sources; one being the UV-C tower of our UVD Robots.

uv-light

 

UV-C wavelengths comprise photons, or particles of light, of the most energetic in the optical spectrum (UV, visible, and infrared) and are, therefore, the most photochemically active2. UV-C germicidal irradiation peaks at 254 nm wavelength3.

Can UV-C light kill bacteria?

The short answer: Yes.

 

The photons cause irreversible damage to the DNA and RNA of an array of microorganisms. When UV-C light is applied, it kills living bacteria and inactivates viruses by interacting with the RNA and DNA molecules, breaking cells on a microscopic level. UV-C germicidal irradiation peaks at 254 nm wavelength.

 

So what does this mean on a practical level? Well, using UV-C light will kill germs and bacteria - ensuring a higher level of disinfection.

 

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  1. https://www.sciencefocus.com/science/how-much-of-the-electromagnetic-spectrum-does-the-sun-emit/ 
  2.  https://www.ies.org/standards/committee-reports/ies-committee-report-cr-2-20-faqs/ 
  3.  Ultraviolet Germicidal Irradiation Handbook