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The use of ultraviolet (UV) LEDs for sterilization and disinfection is nothing new. But a hot topic for the lighting industry this year is the question of UV’s effectiveness against Covid-19. While initial research has been positive, it’s shown that using UV to kill dangerous Covid-19 pathogens is not as simple as turning on a light switch.
UVA, UVB, and UVC—each classified according to their wavelength and energy—are the three main types of UV, a form of electromagnetic radiation. UVC—which has the shortest wavelength and highest energy—is the only UV able to “kill” microorganisms, including viruses and bacteria. According to the International Ultraviolet Association, a dose of 40mJ/cm² of 254nm UVC light kills 99.9 percent of “any pathogenic microorganism” by damaging their DNA, protein, and RNA structures.
This discovery in the early 1900s led to artificially produced UVC—or Ultraviolet Germicidal Irradiation (UVGI)—becoming a common disinfection solution. Used for sterilizing water, air, and nonporous surfaces in hospitals, laboratories, and more, it reduced the spread of many diseases, including SARS CoV in the early 2000s. UVC saved thousands—if not millions—of people from serious illness and death. So, why isn’t UVC already a frontrunner in the fight against Covid-19?
Most experts agree high-intensity UVC can disinfect areas against Covid-19 and kill the SARS-CoV-2 strain quickly. However, there are limitations:
While research shows UVC light is a feasible way to disinfect spaces, it also highlights the need for it to be carefully operated, adapted, and scheduled to be effective in different scenarios, plus only used where no people are present.
Fortunately, there are several ways UVC has already been safely applied in public areas to help protect against Covid-19.
While widely agreed that UVC light won’t fully replace a mop and bucket any time soon, there’s no denying its vast potential in the fight against Covid-19, or the fact that it complements chemical disinfectants by targeting germs in a different way. With further advances that help UV LEDs reach their full potential—in terms of efficiency, reliability, and lifetime—and technologies, such as IoT and 5G smart lighting, it’s reasonable to predict that automatic disinfection could play a big role in helping us overcome Covid-19 in 2021, and, hopefully ensuring, it’s a far more positive year for all.
The Can Covid-19 Really be Fought with UV Light? blog was written by John Hauschild and was first published on https://www.henkel-adhesives.com/.
John Hauschild currently serves as Henkel’s Global Market Strategy Manager for Electronic Components and Industrial Lighting within the company’s Adhesive Technology business unit, where he is focused on setting broad strategic guidance and market insights.
In 2004, Hauschild joined The Bergquist Company (acquired by Henkel in 2014) as a Process Engineer and has since worked in various capacities including process/sourcing engineering, operations management, business management, M&A, as well as marketing. A mechanical engineer by training, he has extensive experience in thermal management solutions and electronic materials applications.
Throughout his extensive cross functional, he has focused on providing reliable, high performance solutions for customers in multiple markets including telecommunications, medical, automotive, lighting, defense & aerospace and power conversion.
Hauschild is passionate about ensuring Henkel materials not only deliver on performance, but also on cost and sustainability objectives. Based in Henkel’s Chanhassen, MN facility, Hauschild holds a Bachelor’s degree in Mechanical Engineering from the Trinity College in Hartford, Connecticut.
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