How UV lamp kills the COVID-19 virus?

  • Updated on 03/08/2020
  • Author: JAX ZHANG

COVID(Corona Virus Disease)-19 is coming at the end of 2019. So all the people are buying KN95(N95)face mask, digital thermometer, air purifier, UV Lamp, etc. Jax is an engineer, works in LED, Mold, Plastic, Wireless doorbell, Connector, etc. Jax will share UV LED knowledge and teach you how to source the right UV LED Lamp.

“What is uv?”

According to “International Electrotechnical Vocabulary (IEV) – Part 845”, ultraviolet radiation(UV) is light radiation of a shorter wavelength than visible light. Ultraviolet light in the wavelength range of 100-400 nm is usually divided into three categories:

  • UV-A: 315-400nm
  • UV-B: 280-315nm
  • UV-C: 100-280nm

Please see their application fields as below:

Ultraviolet classificationApplication fields
UV-A(315-400nm)moth-killing lamp, Ink glue curing, Ore appraisal, Stage decoration, Counterfeit detector
UV-B(280-315nm)plant growth light, Ultraviolet lamp, phototherapy, Anti-counterfeiting recognition
  • sterilization and disinfection: ultraviolet sterilization disinfection is the use of the appropriate wavelength of ultraviolet radiation that can destroy the DNA(deoxyribonucleic acid) or RNA(ribonucleic acid) in the molecular structure of microbial body cells, resulting in growth cell death and regenerative cell death, to achieve the sterilization effect.
  • Application in surface sterilization: widely used in food, electronics, semiconductor, LCD, plasma TV, crystal oscillator, precision devices, chemical, medicine, health care, biology, beverage, agriculture, and other fields.
  • Application in water treatment: the ultraviolet ray produced by the ultraviolet lamp is used to sterilize and sterilize the water.
  • Application in the field of health care: disinfection of air by direct exposure to static air and disinfection of flowing air.


UV-A and UV-B account for 98.1% and 1.1% of the UV rays in the natural sun. UV-C is absorbed by the ozone layer and barely reaches the earth’s surface.

UV-A has a strong penetrating force, can reach the earth’s surface through the ozone layer and clouds, all the year-round, regardless of the rain or shine round exist, stimulate the skin to produce free radicals, degradation of collagen and elastin in the skin, and cause skin melanosis, over time will lead to skin relaxation and dark.

UV-B has medium penetration, especially strong in summer and afternoon, resulting in a short period of skin redness and sunburn. Reasonable irradiation can promote mineral metabolism and vitamin D formation in the body, promote bone development, but long-term or excessive irradiation can cause skin swelling and peeling. Most of the products on the market are used to protect against UV-B.

UV-C is the least penetrating. In sunlight, UV-C is absorbed by the ozone layer before reaching the ground.

Verified by scientists, 260-280nm is the best wavelength.

“How does It work?”

As we know, When ultraviolet radiation irradiates pathogenic microorganisms, it will destroy the molecular structure of DNA(deoxyribonucleic acid) or RNA(ribonucleic acid) in the cells of the microbial body, causing molecular chain break, nucleic acid, and protein cross-link break, making it lose the normal replication to achieve the purpose of reproduction, which is the mechanism of microbial inactivation.


The interactions between the organic molecules and the UV radiation or a deleterious impact on the DNA.

The UV acts on the bases that absorb them, Pyramidins more absorbent than purines.

The main effect of UV is to create dimers of pyrimidines and more particularly dimers of thymine. These dimers create distortions in the conformation of the double helices, which inhibits replication and introduce errors in the DNA sequence.

“How To choose the best UV LAMPs?”

Choose UVLED sterilization is not only to correctly select wave band but also note UV energy, The higher the energy, the better the sterilization effect, the faster the speed, of course, if not careful exposure will lead to greater damage to the human body, especially the harm of eyes, So we must pay attention to safety protection when using, not to let the children old contact.

uv lamp

  1. Power: The easy way, 1M2=1W.
  2. Wavelength:254nm(253.7nm)

“What we need to pay attention to?”

Ultraviolet light can harm the human body. Before using UV lamp products, the following items must be clear:

  1.  When disinfection, people, animals, and plants all need to leave the disinfection site. If the plant cannot be moved, it needs to be covered with something
  2. Just turn on the light to illuminate directly, and let the light shine into as much space as possible.
  3. Disinfect surfaces for 10 to 20 minutes and rooms for 30 to 60 minutes. Use once every 2 to 3 days.
  4. Ventilate for 5-10 minutes after disinfection.
Hello, I’m Yan Sir, the author of this article.
I have been doing online marketing for almost 6 years. I have good luck and achieved financial freedom. I am currently studying more ways to make money at home full-time.
In the process of studying, I found that there are almost no high-quality Chinese resources on the Internet. I know that novices need to experience painful struggles to get started, so I created Inquiry and wrote this article to share with you what I know.

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