The purpose.

I consider to kill COVID-19 as a substance in the space with ultraviolet rays.

(1) to (5) need to be known.

(1) The optimal ultraviolet wavelength to kill COVID-19.
(2) Illuminance using (1).
(3) Irradiation time using (1) and (2).
(4) Wearing the protective glasses. See 2.
(5) At the same time as the application of (4), it must be within the range of measures against ultraviolet rays compared to outdoors in summer.

Finding the wavelength of UV light that is most effective at killing COVID-19, in other words, the wavelength of ultraviolet light that has the least environmental burden other than killing COVID-19.

And if, for example, one-fifth of indoor lighting is changed to the device that emits ultraviolet light, as if when a fluorescent light was changed to an LED light.

UV light and glasses for the attenuation.

With no shielding, this UV light has a brightness of 67.7 kLux (67700 Lux).
This UV light cost $ 8.73.
This light is not for killing COVID-19.
The wavelength of this light is clear, 395 nm (0.000395 mm).

At the same measurement position, PC display is 55.5 Lux.
In other words, the illuminance of this light is about 1220 times that of a PC display.

1.778 kLux (1778 Lux) after passing through an OA glass for PC.
The UV light illuminance has been attenuated by 1/38.
This OA glasses cost around $ 51.

The UV light that passed through a dust protection glasses was 24.5 kLux (24500 Lux).
The UV light illuminance has been attenuated by 1/2.76.
This dust protection glasses cost around $ 4.36.
This form of glass attenuates light from the side.

Even though COVID-19 is invisible, we can see the UV-emitting equipment. Things that cannot be seen are not easily recognized as existing. However, ultraviolet light emitting equipment is visible. People are easy to focus on what they see.

Based on the existing OA glass's ability to block ultraviolet light, and when it is shaped like dust-proof glasses, and if there is a prospect for mass production, it will cost around $ 63. Measuring UV rays protection against skin are based on summer outdoors.

Or artificial sunlight is an idea including UV, if for people disliking the color of UV.

(C) Copyright 2020 Kyo Nissho. All rights reserved.