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First UV Lamp that Kills Coronavirus Safe to Use Around Humans



UV-C Light Safe and Reduces Bacterial Counts on Human Skin

The Ushio Inc. and a research group led by Dr. Ryosuke Kuroda, Chairman and Professor of the Department of Orthopaedic Surgery at the Kobe University Graduate School of Medicine, has conducted the first study on the safety of 222nm UV-C light on humans.

In August 2020, the research group has completed the study wherein the researchers have concluded that irradiation of filtered 222-nanometer UV-C is safe and has a bactericidal effect on the human skin.


However, in occupied spaces, it is important to use filtered 222nm UV-C light. According to Ushio irradiation without blocking higher wavelengths of light has been reported to cause erythema at skin and damage to the cellular DNA.

The study about this is called the “Exploratory clinical trial on the safety and bactericidal effect of 222-nm ultraviolet C irradiation in healthy humans” and it was published at the PLOS ONE Journal in August 12, 2020.

Ushio’s Care222 Lamps Effectively Inactivate SARS-CoV-2

Since other studies involving 222 nm UVC have so far only looked at its potency in eradicating seasonal coronaviruses but not on the COVID-19-causing virus itself, Dr. Hiroki Ohge, a professor at the Hiroshima University Hospital, and a group of researchers have conducted a research to see its effect to SARS-CoV-2, the virus that causes COVID-19.

On September 2020 Dr. Hiroki Ohgeand together with other researchers have completed their study which demonstrates that irradiation with filtered 222nm UV-C light effectively reduces SARS-CoV-2 in an in vitro experiment.

“Hiroshima University researchers found that using Ultraviolet C light with a 222 nm wavelength, which doesn’t harm living cells in the human eye and skin, effectively kills the SARS-CoV-2. This is the first study in the world that proves its potency against the virus which causes COVID-19.”

-Hiroshima University Department of Public Relations




The said in vitro experiment showed that 99.7% of the SARS-CoV-2 viral culture was killed after a 30-second exposure to 222 nm UVC irradiation at 0.1 mW/cm2.ol.

Furthermore, the researchers also noted that the 222nm UVC technology could be used in both occupied and unoccupied spaces for infection prevention and control.

However, since the study only investigated it’s in vitro efficacy, the researchers suggest further evaluation of the safety and effectiveness of 222 nm UVC irradiation viruses in the real-world when it comes to killing SARS-CoV-2.

The study is called the “Effectiveness of 222-nm ultraviolet light on disinfecting SARS-CoV-2 surface contamination” and it was published at the American Journal of Infection Control Journal on September 4, 2020.

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Source: Ushio Inc. Japan|August 2020, Ushio Inc. Japan|September 2020, Ushio Inc. America|August 2020, Ushio Inc. America|September 2020, Hiroshima University, American Journal of Infection Control Journal , PLOS ONE Journal 

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