Regarding disinfecting efficacy
(1) Quantity of energy required for disinfection/deactivation
Energy absorption by DNA in the ultraviolet spectrum is about the same at 222 mm as at the 254 nm wavelength that is generally used for disinfection. This means that the two wavelengths can be expected to have the same disinfecting efficacy.
The energy dosage required for disinfection and inactivation by ultraviolet light is expressed in terms of integrated light exposure, and varies according to type of bacteria or virus. The table above shows the amount of energy required to achieve a sterilization or inactivation level of 99.9%.
<Comparison with conventional 254-nm disinfecting light source>
1. Under ideal conditions, the 222 nm and 254 nm wavelengths both achieved 99.9% sterilization/inactivation with the same energy dosages.
2. With endospore-forming bacteria, the 222 nm wavelength achieves sterilization with about half the energy required at 254 nm.
3. It is expected that the 222 nm wavelength will also be effective for suppressing growth of organisms with larger cells, such as molds.
(2) Relationship between sterilization effect and required time by irradiation distance
① Bacteria (MRSA)
② Virus (Influenza)
(3) Field test results (reference)
Test place
Lighting simulation
Irradiating system
* This instrument is only for evaluation and not for sale.
Test result (Only sample test)
Date: Dec, 2nd – 19th of 2019
- This test has been done on/off switching mode with human sensor. When the meeting room is occupied, the 222nm excimer lamp turned off and start irradiation after they left the room.
- Sampling method
(4) Field test results (reference)
Test place
This test was done to see if Care222™ on ceiling can kill bacteria on environmental surface.
Lighting simulation
Irradiating system
* This instrument is only for evaluation and not for sale.
Test result (Only sample test)
Date: Dec, 2nd – 19th of 2019
- This test has been done on/off switching mode with human sensor. When the meeting room is occupied, the 222nm excimer lamp turned off and start irradiation after they left the room.
- Sampling method