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Which UV light is the best for sterilization?

Sij hawm: 2020-04-08

Nowadays, UV light (ultraviolet light) is popping up as the answer to killing viruses and bacteria. However, if we lack a basic understanding of different UV light, there will be more risks than benefits.


Wha is UV light?


UV lub teeb yog ib hom kev xaiv hluav taws xob hluav taws xob los ncaj qha los ntawm Lub Hnub thiab lub luag haujlwm rau ntau qhov txaus ntshai, piv txwv li, lub caij ntuj sov, tshav ntuj, teeb meem qhov muag, tawv nqaij tawv, thiab lwm yam.

Tsis tas li, UV lub teeb muaj qhov cuam tshuam zoo rau tib neeg lub cev raws li peb txhua tus paub tias nws txhawb Vitamin D ntau lawm thiab pab lub cev tiv thaiv kab mob nrhiav thiab rhuav tshem cov kab mob thiab kab mob kis.

waht is uv light

Nws txoj kev nthwv dej nyob nruab nrab ntawm 100 - 400 nm (nanometer) thiab muaj ntau hom duab hluav taws xob. Yam peb tau paub yog UV-A, UV-B, thiab UV-C. Lawv muaj cov wavelengths sib txawv, cov roj ntsha hauv lub neej thiab kev siv lub neej.

Before formal introduction ,we need to remember one rule of uv light, that is, the shorter the wavelength, the stronger the energy, but the weaker the penetration, the faster the disappearance.

Three types of uv light



UV light: UV-A


A higher wavelength of UV light, which is 320 – 400 nm, is known as UVA light.

About 10% of sunlight being UV light and only about 3% to 4% penetrating the atmosphere to reach the ground. UV Light reaching our Earth's surface has almost 95% of the UVA light and 5% of the UVB light, while most of the UVC light is absorbed by Oxygen which is available in the Earth's atmosphere, thus forming Ozone layer.

proportion of uv light


In a word, we are all exposed to a high level of UVA light in our daylights.

  • Advantages of UV light: UVA

UVA has strong penetrating power and can even invade windows. Therefore, it was widely used for curing. For example, many people use UVA to quicky cure small fillers made of UV-Sensitive resins.

Dua li ntawm kev kho mob, UVA kuj tseem muaj kev tsis saib xyuas kom tsis muaj menyuam.

UVA has a higher IPCE (Incident Photon-to-Current Efficiency) than other uv light wavelengths and can achieve photocatalyst activity when comes into contact with the TiO2.

Photicatalyst action under uv light


Los ntawm kev yees duab photocatalyst, muaj cov tshuaj tiv thaiv oxidation-txo cov tshuaj lom neeg. Txhua yam kab mob uas muaj kab xev, suav nrog cov kab mob, kab mob, haus luam yeeb, formaldehyde, paj ntoos, roj, thiab lwm yam, yuav raug cais tawm mus rau H2O & CO2.

  • Disadvantages of UV light: UVA

1. UVA can penetrate deep into the skin and cause sunburn, aging, and wrinkling on the human skin. It also contributes to the growth of skin cancer.

2. With the longer wavelength, UV teeb has weaker energy. Therefore, UVA can't kill virues and bacteria alone without photocatalyst activity.


UV Light: UVB


UVB light has a shorter wavelength, ranging between 280 nm and 320 nm. It can be filtered and can not propagate through glass materials.


  • Advantages of UV light: UVB

People suffering from a shortage of Vitamin D and high blood pressure, exposure of the UVB light assists in lowering their blood pressure.

The favorable features of UVB light can be used to protect human beings from infection and treat few skin problems.

  • Disadvantages of UV light: UVB


UVB light is mainly accountable for causing skin burns. It infiltrates the out layer of the human skin and causes severe injuries.

It has neither strong energy nor strong penetrating ability, so it belongs to the uv light without help in sterilization.


UV Light: UVC


A part of UV light having the shortest wavelength is known as UVC light. Its wavelength is 200-280 nm and is popular for its sterilization effect.

Although UVC light can't reach the earth's surface, many manufacturers have developed man-made UVC LED.


Txhawm rau ua kom zoo dua ntawm UVC teeb, peb tau tsim lub thev naus laus zis tshiab teeb pom kev zoo, uas tuaj yeem ua rau UVC kev sib xyaw rau hauv qhov me me uas muaj 3.5 hli x 3.5 hli tsis muaj mercury.

  • Advantages of UV light: UVC


UVC has a number of benefits for human beings. It isolates the DNA of a germ that disallows the germ to breed or propagate and minimize its attacks on the living bodies including humans.


Nws ua rau tuag taus rau cov kab mob me me xws li kab mob, kab mob, thiab lwm yam, uas ua rau muaj mob sib txawv xws li hawb pob, claus, los yog tus mob npaws.


uv light spectrum


  • Disadvantages of UV light: UVC

1. UVC can not discriminate between the human body and viruses, bacteria. It is responsible for redness and ulceration of the human skin and affects the human eye cells when a human body is exposed to it for a short period of time.

2. UVC has the tendency of electromagnetic waves to travel in a straight line. Combined with weak penetration ability, the sterilization conditions for UVC are strict, including small & confined space, long enough operating time, working without the presence of the human.

In conclusion, different UV lights have different functions. We should understand them in depth and make full use of their strengths. Only in this way can we achieve the best sterilization effect.

Lwm Yam Tshooj: Qhov kawg ntawm tus neeg yuav khoom ntawm koj li UV teeb yuav

Npaum UVC LED daws rau Minisplits


Kev siv UVC kom zoo rau HVAC Chav Nyob