29 September 2020
Crystal IS and Boston Uni demo Klaran UVC LEDs’ effective wavelength for inactivating SARS-CoV-2
Crystal IS Inc of Green Island, NY, USA, an Asahi Kasei company that makes proprietary ultraviolet light-emitting diodes (UVC LEDs), and Boston University’s National Emerging Infectious Diseases Laboratories (NEIDL) have performed research demonstrating the efficacy of Crystal IS’ Klaran UVC LEDs to inactivate the SARS-CoV-2 virus.
Crystal IS initiated the research to understand how SARS-CoV-2, the virus that causes COVID-19, responds to ultraviolet light across the emission range of Klaran UVC LEDs (260-270nm) and at different doses.
During the study, an array of Klaran UVC LEDs was used to irradiate a surface containing SARS-CoV-2. The results show a log reduction achieved from exposing the virus to a UVC intensity of 1.25mW/cm2 at different time intervals. The test was then repeated using a dose of 5mJ/cm2 from LEDs that emit at a peak wavelength representing both ends of the Klaran LED wavelength specification (260nm and 270nm). The results indicate similar efficacy across the tested range.
“The research by NEIDL at Boston University demonstrates that SARS-CoV-2 can be effectively inactivated in a matter of seconds through exposure to low doses of UVC light in the key germicidal range,” says Crystal IS’ president Larry Felton. “However, comparing test results from this study against published results from the University of Miyazaki [www.tandfonline.com/doi/full/10.1080/22221751.2020.1796529] (which used UVC LEDs emitting at 280nm) highlights a marked drop in efficacy beyond 270nm wavelength,” he adds. “While there is much to be done in the fight against the coronavirus pandemic, Crystal IS believes this type of data can be used to help design innovative and effective disinfection solutions.”
Klaran UVC LEDs are currently being used by a number of partners, including Healthe Air by Healthe Inc, and Big Ass Fans Clean Air System Haiku with UV-C, which provides continuous disinfection and clean airflow in retail, restaurant, fitness and office settings.