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Columbia University

Using the Power of Light: Preventing the Airborne Spread of Coronavirus and Influenza Virus

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Physics World

The potential of far-ultraviolet light for the next pandemic

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Killing coronavirus with handheld ultraviolet light

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Killing coronavirus with handheld ultraviolet light device may be feasible

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SCIENTIFIC SUPPORT

Corona Virus Pandemic

Dosage Required

Germicidal Effects

Germicidal Effects

This paper advises the UV dose required to inactivate various pathogens, including bacteria, protozoa, viruses and algae based on the lamp type.  Authors: Malyeri A.H., Mohseni M., Cairns B., Bolton, J.R., Chevrefils G., Caron E. 

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Covid-19 Solution

Germicidal Effects

Germicidal Effects

Germicidal Effects

This study discusses the germicidal effects of 222nm (Far-UV) light, which is significantly harmful to bacteria, but demonstrates no harm to human cells.  Authors: Manuela Buonanno, Brian  Ponnaiya, David Welch, Milda Stanislauskas, Gerhard Randers-Pehrson,  Lubomir Smilenov, Franklin D. Lowy, David M. Owens, and David J. Brenner 

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CoronaVirus Solution

Human Safety

Germicidal Effects

Human Safety

This study focuses on the human safety in regards to long term exposure of 222nm (Far-UV) light and suggests 222nm FAR-UVC lamp can be safely used on humans.  Authors: Nozomi Yamano, Makoto  Kunisada, Sachiko Kaidzu, Kazunobu Sugihara, Aiko Nishiaki-Sawada,  Hiroyuki Ohashi, Ai Yoshioka, Tatsushi Igarashi, Akihiro Ohira, Masaki  Tanito, and Chikako Nishigori 

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Press Room

The DEFENDER prevents Covid-19 virus

Daytona Beach firm hits market with wearable UV device that fends off COVID-19 virus

The company is developing a wearable UV germicide irradiation device using far-UVC technology. The company says the product, dubbed The DEFENDER is designed to eradicate airborne viruses before the pathogens can enter the human body and infect an individual.

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UV Light for Sanitization

Light is comprised of different  wavelengths, each with their own unique properties. The germicidal  properties of ultraviolet (UV) light, part of the non-visible spectrum,  can be harnessed to effectively sanitize the air, water and surfaces. At  the appropriate wavelength and fluence (dose), exposure to ultraviolet  light modifies or destroys the genetic material (DNA and RNA) in  viruses, bacteria and mold, preventing replication.

Healthe air and surface sanitizing products employ various combinations of UV light  and filtration to inactivate pathogens, including Far UV-C (200-230nm),  UV-C (231-280nm) and UV-A (365nm 

UV Effectiveness and Safety

The effectiveness of UV on inactivating or destroying microbes  depends on the microorganism’s structure, size and resilience, in  addition to the UV exposure parameters including duration of exposure,  wavelength and intensity (see SCIENTIFIC SUPPORT).

UV-C  (231-280nm) must be shielded from humans as it poses a carcinogenic  safety risk. Continuous low doses of Far UV-C (200-230nm) have been studied and no human effects reported (see SCIENTIFIC SUPPORT).  

GERMICIDAL EFFICACY AND MAMMALIAN SKIN SAFETY OF 222-NM UV LIGHT

Authors: Manuela Buonanno, Brian Ponnaiya, David Welch, Milda Stanislauskas, Gerhard Randers-Pehrson, Lubomir Smilenov, Franklin D. Lowy, David M. Owens, and David J. Brenner

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LONG TERM EFFECTS OF 222 NM RADIATION C STERILIZING LAMPS ON MICE SUSCEPTIBLE TO ULTRAVIOLET LIGHT

Authors: Nozomi Yamano, Makoto Kunisada, Sachiko Kaidzu, Kazunobu Sugihara, Aiko Nishiaki-Sawada, Hiroyuki Ohashi, Ai Yoshioka, Tatsushi Igarashi, Akihiro Ohira, Masaki Tanito, and Chikako Nishigori

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FLUENCE (UV DOSE) REQUIRED TO ACHIEVE INCREMENTAL LOG INACTIVATION OF BACTERIA, PROTOZOA, VIRUSES

Authors: Malyeri A.H., Mohseni M., Cairns B., Bolton, J.R., Chevrefils G., Caron E.

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The DEFENDER launches September 30

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