High-power UVC LED assembly for disinfection

High-power UVC LED assembly for disinfection

Product information

LED 1 light type

LED 1 light type

UVM001-0101U1

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LED 4 lights type

LED 4 lights type

UVM002A-0401U1

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LED 6 lights type

LED 6 lights type

UVM003A-0302U1

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Characteristics of the product

  • Time for disinfection is reduced by effective and uniform illuminance through a reflector
  • Adopts a deep ultraviolet LED with 265 nm wavelength which has a high germicidal effect
  • Irradiation over a wide area from a short distance with high efficiency
  • A product with dustproof and waterproof properties (equivalent to IP54)
  • An ultra-high- power product with four or six LEDs
UVM001-0101U1 UVM002A-0401U1 UVM003A-0302U1
Appearance LED 1 light type LED 4 lights type LED 6 lights type
Light distribution angle Narrow
Middle
Wide

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Disinfection effect of 265 nm

*Refer to JIS Z 8811-1968 “Relative value of disinfection effect according to equivalent radiated power wavelength”

  • Compared with 275 nm peak wavelength, disinfection effect is approximately 1.3 times higher at central wavelength and 1.5 times higher at maximum wavelength.

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Test on the inactivation effect on SARS-CoV-2

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).

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. With these properties, downsizing of the device is realized and disinfection of a wide area in a short time is achieved. 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.

This UVC LED assembly product has a high-power UVC LED with peak wavelength 265 nm. 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. 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).

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.

Test 1: Test on the inactivation effect on SARS-CoV-2
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.
Results:
From the height of 5 cm, inactivation of 99.9% after 10 seconds, and inactivation of 99.99% after 20 seconds was confirmed.
From the height of 15 cm, inactivation of 99.9% after 100 seconds, and inactivation of 99.99% after 200 seconds was confirmed.
The irradiation dose required for inactivation of 99.9% was 4.73mJ/cm2.The irradiation dose required for 99.99% was 9.46mJ/cm2.

Test results for infection ratio of virus

Test results for infection ratio of virus

Time for inactivation at each distance

99.9% 99.99%
5cm 10sec. 20sec.
15cm 100sec. 200sec.

Irradiation dose required for inactivation

99.9% 99.99%
Irradiation dose for inactivation 4.73mJ/cm2 9.46mJ/cm2

Cells infected with virus that were not irradiated with ultraviolet rays

Cells infected with virus that were not irradiated with ultraviolet rays

Severe cellular cytotoxicity was confirmed

Cells infected with virus that were irradiated with ultraviolet rays

Cells infected with virus that were irradiated with ultraviolet rays

No cellular cytotoxicity was confirmed.
It means that the virus was inactivated

Test 2: Inactivation test against SARS-COV-2 by using two LEDs with different peak wavelengths
Summary and results of the test

Method:
UVC light of 265 nm and 275 nm each is lit from the height of 20 cm and the time required for
inactivation is measured by TCID50 measuring method. Drive conditions were adjusted in
order to achieve UVC illuminance of 0.025mw/ cm2 for both LEDs.
Results:
As for 265 nm, from the height of 20 cm, inactivation of 99.9% after 300 seconds was confirmed.
The irradiation dose required was 7.5mJ/cm2.
As for 275 nm, from the height of 20 cm, inactivation of 99.99% after 600 seconds was confirmed.The irradiation dose required was 15.0mJ/cm2.
From the above results, it was confirmed that LED with 265 nm peak wavelength, which is used forour product, is able to achieve an inactivation effect in a shorter time (about half).

Test results for infection ratio of virus

Test results for infection ratio of virus

Time and irradiation dose required for inactivation from the height of 20 cm

265nm 275nm
Inactivation of 99.99% 300sec. 600sec.
Irradiation dose 7.5mJ/cm2 15.0mJ/cm2

Photos of test

Photos of test

* Fujita Health University
Fujita Health University is actively working on research and development targeting SARS-CoV-2. At the time of the spread of the infection on the passenger ship Diamond Princess in 2020, the university admitted infected patients and provided medical institutions in Japan with information about pioneering cases useful in preventing the spread of the infection. The cases were called “the Fujita Model.”

Supplementary material
Test 3

Summary and results of the test

Method:
Illuminance of UVC light with 265 nm wavelength was adjusted to a lower degree,
0.016 W/c㎡. Then, UVC light is lit from the height of 20 cm and the time required for
I inactivation is measured by TCID50 measuring method
Results:
Inactivation of 99.99 % after 600 seconds was confirmed. The irradiation dose required was 9.6
/cm2.It was confirmed that with 265 nm wavelength, even by illuminance of 0.016mW/ cm,2
inactivation effect equivalent to that of 0.025mW/c㎡ in Test 2 is achieved.

Test results for infection ratio of virus

Test results for infection ratio of virus

Illuminance required for inactivation by different wavelength

265nm 275nm
Inactivation of 99.99 % 600 sec. 600 sec.
Illuminance 0.016mW/cm2 0.025mW/cm2

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Test on disinfection of bacteria coliform

Disinfection test from an irradiation distance of 2.4m and directly under the light source

Item GL-15(15W) UVM003(Narrow angle x 4 pieces)
Illuminance directly under the light source 0.006 mW/cm2 0.008 mW/cm2
Time required for disinfection of bacteria coliform 99.9% Approximately 17 minutes Approximately 15 minutes
99.99% Approximately 20 minutes Approximately 17 minutes
99.999% Approximately 28 minutes Approximately 20 minutes

Before test

After test
(After 15 minutes of irradiation)

Test results by Kitasato Research Center for Environmental Science(Hokuseihatsu No. 2021_0333)

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Simulation support

  • We can provide various simulations in accordance with the illuminance area,
  • irradiation time and irradiation dose required by the customer.

Example: Simulation of disinfection in an instant ID photo booth

Application: Disinfection of touch panel and seat in ID photo booth
Light source: UVM003A-0302U1-RM1, 1pcs
Drive current: IF=500mA
Placement of light source: On the back wall, 100cm from the floor. Optical axis is tilted by 45 degrees
LED 6 lights type

Simulation model

Simulation model

Distribution of irradiance

Distribution of irradiance
*1
Target Irradiance(mW/cm2 Time required for disinfection (minute)
Touch panel MAX 0.0269 3.1
MIN 0.0179 4.7
Seat MAX 0.0630 1.4
MIN 0.0169 5.0

*1 Required irradiance dose for 99.9 % inactivation of SARS-CoV-2 is 5mJ/cm2 (Calculated from test results of Citizen
Electronics. This simulation data consists of reference values only calculated by Citizen Electronics and is not guaranteed.

Inactivation effect of 99.9% against viruses after 5 minutes was confirmed.

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Handling precautions for UVC LED product

  • This product is a product that emits deep ultraviolet rays (UVC).
    UVC has a strong influence on cells, so direct exposure to the body is dangerous.
  • JISZ8812 defines the allowable amount of ultraviolet rays, which is 4.6 mJ / cm2 (8 hours a day) for 260 nm and 3 mJ / cm2 (8 hours a day) for 270 nm. As it may affect the human body even from long distances, please take measures such as using protective glasses or gloves to prevent direct exposure of ultraviolet rays to the human body when looking directly at UVC light or lighting the reflected light.
    Do not look at UVC lighting source directly because there is a risk of eye pain or visual impairment.
    Also, pay attention not only to the direct light itself but also to reflected light.
    Irradiating the skin directly with UVC light may cause skin irritation.
  • Disassembling or modifying the product may cause a part to drop off, fire, electric shock, or injury.
  • If you connect or disconnect the power supply line or operate the product with wet hands, you may receive an electric shock.
  • If you notice a strange odor or smoke, cease operation it immediately. It may cause a fire or electric shock.
  • Covering or sealing the product may cause heat to build up inside and it may cause a fire or malfunction.
  • Do not use for any purpose other than sterilization.
  • Do not add excessive shock by a dropping and so on. It may cause a malfunction or an unexpected accident.
  • Do not touch the irradiation window or place anything on it as this may cause a malfunction or result in an unexpected accident.
  • Plants are sensitive to UV light. Depending on the type of plant, the leaves may wilt or die.
  • Ensure the power supply system of this product is separate from lighting equipment and other equipment.
  • Ultraviolet rays deteriorate wallpaper or resin products, etc. Also, if you irradiate at a short distance, the color of such may change rapidly. Please be careful regarding deterioration and discoloration of the object exposed to light.
  • Do not touch the area near the irradiation window with your bare hands during or immediately after irradiation.
    The irradiation window and its surroundings may be hot during or immediately after irradiation.
    Therefore, please do not touch the irradiation window or its surroundings.
  • We are not liable for any personal or property damage caused to you or a third party due to UV exposure.
  • Please make sure that UVC light outside the irradiation area does not affect the human body or the irradiated object in advance.
    Do not touch the irradiation window or place anything on it as this may cause a malfunction or result in an unexpected accident.

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