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207nm 220nm 222nm Far UVC Led Chip Strip Light Inactivate Bacteria Without Harm Skin

207nm 220nm 222nm far UVC Led chip strip light kill virus


207nm 220nm 222nm far UVC Led chip strip light inactivate bacteria without harm skin


1. Size(mm): 3.60*3.60*1.4

2. wavelength: 222nm

3. Viewing angle: 160°

4. High reliability

5. Suitable for all SMT assembly and solder process

6. Inorganic packaging

7. RoHS compliant

far uv led

far uvc led size

Parameters of the 207nm 220nm 222nm far UVC Led chip strip light

uvc led wavelength

table 1

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207nm 220nm 222nm far UVC Led chip strip light  can slow spread of novel coronavirus COVID-19

Airborne-mediated microbial diseases such as influenza and tuberculosis represent major public health challenges. A direct approach to prevent airborne transmission is inactivation of airborne pathogens such as Coronavirus, and the airborne antimicrobial potential of UVC ultraviolet light has long been established; however, its widespread use in public settings is limited because conventional UVC light sources are both carcinogenic and cataractogenic.

However there has been a breakthrough, its been proven that far-UVC light (207-222 nm) efficiently inactivates bacteria without harm to exposed mammalian skin.This is because, due to its strong absorbance in biological materials, far-UVC light cannot penetrate even the outer (non living) layers of human skin or eye; however, because bacteria and viruses are of micrometer or smaller dimensions, far-UVC can penetrate and inactivate them.

For the first time people can now use far-UVC to safely and efficiently inactivate airborne aerosolized viruses, with a very low dose of only 2 mJ/cm2 at 222nm light, this was proven to work by inactivating >95% of aerosolized H1N1 influenza virus.

Most scientists and engineers in the UV business now use the units "mJ/cm2" (millijoule per square centimeter) or "J/m2" (joule per square meter) for UV dose (the correct term is"fluence"). The units "J/m2" are used in most parts of the world except for North America, where "mJ/cm2" are used (1mJ/cm2 =10 J/m2. The old term "mW-s/cm2" (milliwatt-second per square centimeter) is equivalent to "mJ/cm", since a "W-s" is the same as a "J" (joule). Note that 1000 microwatt = 1 milliwatt.

The units "mW/cm2" (for fluence rate or irradiance) are often confused with the units "mJ/cm2" (for fluence or UV dose). The "fluence" (UV dose) is obtained by multiplying the "fluence rate" (or irradiance) (units "mW/cm") by the exposure time in seconds.

Continuous very low dose-rate far-UVC light in indoor public locations is a promising, safe and inexpensive tool to reduce the spread of airborne-mediated microbial diseases.

The most commonly used lights have a wavelength of 254 nanometers (nm), which has a relatively short UV wavelength—the so-called "C" category—but can penetrate the skin and eyes, leading to cancers and cataracts. So for the past 4 years, a group led by physicist David Brenner at Columbia University Medical Center in New York City has tested shorter wavelengths, known as “far UVC light” that can’t penetrate the outer layers of the eyes or skin. The researchers found that far UVC eliminated bacteria on surfaces and did not harm lab mice.

The invention increases the safety of both staff, patients and their relatives by reducing the risk of contact with bacteria, viruses and other harmful microorganisms. The concentrated UV-C light emitted has a very strong, yet very safe germicidal effect that removes virtually all airborne viruses and bacteria on the surfaces of a room.


207nm 220nm 222nm far UVC Led chip strip light inactivate bacteria without harm skin

Continuous low doses of far-UVC light have been shown to kill airborne flu viruses without harming human tissue. Far-UVC light could offer a low-cost solution to controlling airborne microbial diseases in indoor public spaces. 
A study conducted by the Center for Radiological Research at Columbia University Irving Medical Center (CUIMC) tested if far-UVC light could efficiently kill aerosolized influenza virus in the air, in a setting similar to a public space.

222nm test

Researchers tested the efficacy of 222-nm far-UVC light to inactivate influenza A virus (H1N1) carried by aerosols in a benchtop aerosol UV irradiation chamber, which generated aerosol droplets of sizes similar to those generated by human coughing and breathing. Aerosolized viruses flowing through the irradiation chamber were exposed to UVC emitting lamps placed in front of the chamber window. A control group of aerosolized virus was not exposed to the UVC light.
The far-UVC light inactivated the flu viruses with about the same efficiency as conventional germicidal UV light. 
Scientists have known for decades that broad-spectrum UVC light is highly effective at killing bacteria and viruses by destroying the molecular bonds that hold their DNA together. However, its widespread use in public settings is limited because conventional UVC light sources can lead to skin cancer and cataracts. 
"Far-UVC light has a very limited range and cannot penetrate through the outer dead-cell layer of human skin or the tear layer in the eye, so it's not a human health hazard. But because viruses and bacteria are much smaller than human cells, far-UVC light can reach their DNA and kill them," said professor David J. Brenner. 
"And unlike flu vaccines, far-UVC is likely to be effective against all airborne microbes, even newly emerging strains." he said. 
The study used single-wavelength far-UVC light generated by filtered excilamps. Use of low-level far-UVC fixtures, which are potentially safe for human exposure, could provide the desired antimicrobial benefits without the accompanying human health concerns of a conventional germicidal lamp UVGI. At a cost of less than $1,000 per lamp — which could decrease if the lamps were mass produced — far-UVC lights are relatively inexpensive. 
"If our results are confirmed in other settings, it follows that the use of overhead low-level far-UVC light in public locations would be a safe and efficient method for limiting the transmission and spread of airborne-mediated microbial diseases, such as influenza and tuberculosis." 
said Brenner. 

The research was published in Scientific Reports.

far uv wavelength

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