Stanley Electric Co., Ltd., Tokyo, Japan has confirmed high effectiveness of virus inactivation (inability to multiply) of SARS-CoV-2 (the virus that causes COVID-19), using its 265nm UVC LED, which has started mass production from July 2020, as a result of conducting an evaluation test in collaboration with Yamaguchi University (Dr. Daisuke Hayasaka and Dr. Hiroshi Shimoda, Laboratory of Veterinary Microbiology, Joint Faculty of Veterinary Medicine).
Stanley Electric is aiming to use this 265nm UVC LED for various applications, such as surface sterilization, air sterilization and water disinfection for providing safe drinking water, to control infection against SARS-CoV-2.
The company will continue to verify the superiority of this wavelength, by conducting further evaluation tests with different wavelengths of UVC light sources. Verification results will be shared once the testing is completed.
Test Result Summary
Virus evaluated: SARS-CoV-2
Test method: 10 ml of virus solutions (5 x 10⁵ PFU/mL) in dishes were irradiated with 265nm UVC LED at different time points. Infectious virus titers were determined by plaque assay on cells.
Test result: Inactivation rate of SARS-CoV-2 is 99.9% or more, when the UV Dose is 5.1mJ/cm2.
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