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What's the difference between UV-C and Far-UVC? <br />Page 3 of 5 <br />When you ask experts in the lighting industry about far-UVC, there is mixed reaction. Some <br />experts believe far-UVC is safe for humans. Others say there is not enough evidence to back <br />up those claims, <br />David Brenner, COVID-19 Virtual Symposium: Apr... <br />C►7 <br />Dr. David Brenner, a scientist at Columbia University, started talking about the benefits of far- <br />UVC several years before the COVID-19 pandemic. <br />Dr. Brenner gave a TED talk (http://www.columbia.edu/—dib3/Far%20UVC.htmi) about the <br />benefits of far-UVC against superbugs like coronaviruses and the flu. He believes far-UVC is <br />a tool that can be used to limit the transmission of SARS-CoV-2 in public places. <br />Dr. Brenner is continuing his research on far-UVC and just released a study in June <br />explaining how far-UVC kills coronaviruses <br />(https://www.sciencedaily,com/releases/2020/06/20062417205O.htm) . <br />The International Ultraviolet Association is taking the opposite approach and believes far-UVC <br />is not ready for widespread applications yet (https://iuva.org/Projects-Articles- <br />Repository/8926263) . Their argument is based on limited testing on humans. <br />However, scientists are starting to test far-UVC on humans. A study published in August <br />2020(https:/Ijournals.plos.org/plosone/article?id=10.1371/journal.pone.0235948) tested the <br />safety of 222 nm light on human skin. Scientists exposed patients at hospital in Japan to <br />doses as high as 500 mJ/cm . <br />To put that in perspective, the current threshold limit for far-UVC products is between 22 and <br />23 mJ/cmz . <br />If you'd like to read more into each side of the debate, we have several studies and reports <br />on far-UVC posted here (https://shop.regencylighting.com/guv-studies-reports/) . One study <br />found the safety of far-UVC essentially depends on the quality of the product. <br />Pros of far-UVC A <br />• Safe for skin and eyes — According to most research, far-UVC products are <br />safe for skin and eyes. Far-UVC does not penetrate the outer layer of skin or <br />eyes, so it doesn't cause any tissue damage. <br />https://insights.regencylighting.con-/uvc-vs-faruvc 11/11/2020 <br />