Test results for infection ratio of virusĬells infected with virus that were irradiated with ultraviolet rays The irradiation dose required for inactivation of 99.9% was 4.73mJ/cm2.The irradiation dose required for 99.99% was 9.46mJ/cm2. Results: From the height of 5 cm, inactivation of 99.9% after 10 seconds, and inactivation of 99.99% after 20 seconds was confirmed.įrom the height of 15 cm, inactivation of 99.9% after 100 seconds, and inactivation of 99.99% after 200 seconds was confirmed. Summary and results of the test Method: UVC light is lit from the height of 5 cm/15 cm and the time required for inactivation is measured by TCID50 measuring method. Test 1: Test on the inactivation effect on SARS-CoV-2 It is expected to be used for surface sterilization and air sterilization to control new coronavirus infection, as well as for water sterilization to provide safe water. As a result, it was confirmed that the LED with 265 nm peak wavelength, which is used by our UVC LED assembly, can achieve an inactivation effect against viruses in a shorter time (about half) (Test 2). We have conducted a test to compare the inactivation effect by replacing the LED of the assembly product with an LED having 275 nm peak wavelength. This UVC LED assembly product has a high-power UVC LED with peak wavelength 265 nm. In addition, as we have confirmed that the required irradiation dose for inactivation is 4.73mJ/ cm2, customers can adjust the irradiation dose, which is indispensable in the design of a disinfection device, in accordance with the purpose. With these properties, downsizing of the device is realized and disinfection of a wide area in a short time is achieved. Through use of our mounting technology and optical technology that were created during our history of developing LEDs, our UVC LED assembly product, which has a 265nm wavelength with a high germicidal effect and an appropriate light distribution for the target, was confirmed to have an inactivation effect of 99.9% against viruses over a wide area after only 10 seconds and 99.99% after 20 seconds when lit from a height of 5 cm. We have collaborated with Fujita Health University (School of Medicine, Associate Professor Kawamoto of Virology and Parasitology) to verify an inactivation effect on SARS-CoV-2 through use of not our single UVC LED, but our UVC LED assembly, also confirming its high inactivation effect (Test 1). Test on the inactivation effect on SARS-CoV-2
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