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 UVC (200-230nm), UV-C (231-280nm) and UV-A (365nm).
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).
Authors: Malyeri A.H., Mohseni M., Cairns B., Bolton, J.R., Chevrefils G., Caron E.
This paper advises the UV dose required to inactivate various pathogens, including bacteria, protozoa, viruses and algae based on the lamp type.
Authors: Manuela Buonanno, Brian Ponnaiya, David Welch, Milda Stanislauskas, Gerhard Randers-Pehrson, Lubomir Smilenov, Franklin D. Lowy, David M. Owens, and David J. Brenner
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: Nozomi Yamano, Makoto Kunisada, Sachiko Kaidzu, Kazunobu Sugihara, Aiko Nishiaki-Sawada, Hiroyuki Ohashi, Ai Yoshioka, Tatsushi Igarashi, Akihiro Ohira, Masaki Tanito, and Chikako Nishigori
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