In April this year, news showed that a joint study between Kobe University in Japan and Ushio, a Japanese LED component manufacturer, showed that using filtered 222 nm UVC light to repeatedly irradiate hairless cells with particularly sensitive skin In mice, it does not cause them to develop skin cancer or cataracts. It is thus proposed that deep ultraviolet radiation with a wavelength of 222nm is harmless to human skin and eyes.
Similarly, Columbia University in the United States has also conducted relevant research. Preliminary results show that far UVC with a wavelength of 222nm cannot penetrate the skin surface or eyes, is safe for the human body, and can also kill viruses.
It is reported that Ushio and a research team from the Department of Plastic Surgery at Kobe University completed a study showing that irradiating filtered 222nm UVC light on human skin can reduce the number of bacteria on human skin without causing any damage to the skin. damage.
This study used Oxtail's Care222? UV-C disinfection equipment, which has a wavelength of 222m, a radiant energy of 500 mJ/cm2, and contains an optical filter. This short-bandpass filter is based on Columbia University research and technology and has been patented to filter radiation with wavelengths above 230nm.
But unfiltered 222 nm UV-C lamps, if not properly filtered, can pose a serious threat to human health. The 222 nm exterior line lamps currently on the market are not monospectral. "222 nm" only refers to the peak wavelength, other wavelengths are also emitted, many of which are harmful. Even a 222nm UV lamp is dangerous without filtering as the lamp produces light up to 320 nm! To be clear: the UV-C “safe zone” is between 200 nm and 230 nm. There is still a lot of controversy in the industry about the claim that UVC light can kill coronavirus and that UVC light with a wavelength of 222nm is harmless to the human body. People from all walks of life are paying great attention to this, and they also look forward to more and more detailed studies to prove these results