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A luz UVC pode matar os virus e as bacterias?

Equipo: 2020-04-21

For decades, scientists have been devoted to the research of UVC light for disinfection, especially when the UVC market is huge and the human pursuit of health is more important than ever before.


More and more reports indicate that UVC light products can kill viruses and bacteria higher than a 99.9% rate, which directly leads to the crazy purchase of UVC products.


But in fact, few people know exactly what UVC light is and whether UVC light is useful for sterilization.

A continuación, explicaremos en detalle what UVC lights are, how they work, their precautions for use and some commercial applications para axudarche a ter unha comprensión clara.


uvc light sterilization


Wha is UVC light?


Como todos sabemos, a luz solar é unha mestura de enerxía da luz a diferentes lonxitudes de onda.


As lonxitudes de onda oscilan entre 380 nanómetros (nm) e 780 nanómetros (nm) denomínanse luz visible, mentres que as que están fóra do rango de lonxitude chámanse luz invisible.

Ultraviolet light is a type of invisible light ranging from 10 nm to 400 nm. And the function of UV light depends on the range of wavelength.

  • UV-A: 320nm a 400 nm

It makes up the majority of UV light reaching the Earth. And it can damage our skin.

  • UV-B: 280nm a 320nm

Pode tratar enfermidades da pel. Pero unha excesiva exposición provocará queimaduras e incluso cancro de pel. E só menos do 2% dos UVB poden chegar á terra.

  • UV-C: 200nm a 280nm

It is particularly good at sterilizing. But its penetration ability is very weak. Before reaching the ground, all UVC light will be absorbed by ozone in the atmosphere. That means, standing under the sun is useless for sterilization.

  • In summary: UV light Rule

Canto máis curta é a lonxitude de onda, máis forte é a enerxía, pero canto máis feita é a penetración, máis rápido será a desaparición.


Function of UVC light

Related Knowledge: Which UV light is the best?

Because UVC light can be used for sterilization, coupled with the epidemic environment, the market demand for UVC products can be described as Crazy now.

E a valoración do mercado incluso pasou de 140,000,000 dólares estadounidenses a aproximadamente 500,000,000 de dólares estadounidenses.

The big question right now may be how does UVC light work and can it kill viruses & bacteria?


How does UVC light work?


Before the deep study of UVC light, I thought all sunlights have the sterilization effect. Bacteria and viruses will be killed by "sunburn" or heat.

But that's not the truth.


  • Sterilization Principle of UVC light


In fact, UVC light will destroy the DNA or RNA of the bacteria & viruses, without the use of chemicals, making them inactive and unable to reproduce.

Since the lifespan of single bacteria & viruses is very short, once they lose the reproduce ability, it means death. So the purpose of sterilization has been achieved.


In scientific research, it has been found that UVC light can use very little time to finish the disinfection process and make most microbes reduction up to 99.99%.


Research of UVC light

Based on this information, UVC light is believed to be quiet effective at killing viruses and bacteria.


However, the vitality of different viruses and bacteria are different. Some bacteria&viruses may be injured once they are exposed to UVC light, while others are not.


Se a dose ultravioleta é insuficiente, algúns virus só perderán temporalmente actividade e logo reparan lentamente a súa propia estrutura.


  • Special requirements of UVC lights

At present, there are no specific figures to show how much UV dose flu viruses needs to be killed. Maybe 1,085 mJ / cm2 or 3,640 mJ / cm2 . Anyway, a huge number.

You may be wondering if we stand under the sunlight containing UVC light, can we be disinfected by it?

Unfortunately, the answer is no. Although the sterilization ability of UVC light is extremely strong, the penetration ability to objects (including air) is extremely weak. Before reaching the ground, all UVC light will be filtered out by ozone in the atmosphere.

É por iso que necesitamos usar un portador similar ás lámpadas de desinfección ultravioletas para conseguir a desinfección.


Please pay attention to the fact that most UV lamps on the market are only designed to meet the common standard, that is, 40mJ / cm2 UV dose required for a 99.99% inactivation rate.


Study result of UVC light

Further considering the decay of UVC light in the air, those lamps make no sense for disinfection.

Así que non creo facilmente que algunha empresa di "podemos matar os virus e as bacterias", ás veces é só a linguaxe de mercadotecnia

Temos que entender que só a eficiencia, o tempo e o custo son os factores clave na nosa elección das lámpadas UV.


Are ultraviolet lamps containing uvc light safe?


Although UVC light can indeed kill viruses and bacteria, there are various problems with household ultraviolet disinfection lamps on the market:

(1) As lámpadas tradicionais de desinfección ultravioleta son grandes (polo menos 40 cm de altura ou por riba) e de baixa eficiencia. A fonte de luz LED de 1W pode cubrir basicamente só 1 metro cadrado de espazo.


(2) A fonte de luz da maioría das lámpadas de desinfección ultravioleta contén mercurio, o que é prexudicial para o medio ambiente e a saúde, se se libera.

(3) A maioría das lámpadas de desinfección ultravioleta son lámpadas de amplo espectro incluíndo UVC, UVA e UVB, que son susceptibles de producir ozono, provocando síntomas como fatiga, tose, aperte no peito, náuseas e perda de memoria.


Applications of UVC light

From this perspective, the main application scenarios of UVC light should be industrial types to maintain safe.


Applications of uvc light


To make better use of UVC light, we have developed a new lighting technology, which can make the UVC energy in a very small size with 3.5mm x 3.5mm without mercury.


Con este tamaño, pode aplicarse en moitos equipos portátiles con funcións de desinfección:

(1) Superficie


Superficies contaminadas como habitacións e equipamentos do hospital, salas de estar, aeroportos e case todos os lugares públicos ou obxectos privados.


(2) Auga


Mercury-free UVC light is a clean and safe water disinfectant, UVC LED based solutions tackle these pathogens without impacting the water's smell, taste or mineral contents.

Podemos empregar solucións UVC no sistema de purificación de auga ou no sistema hixiénico.


(3) Aire


Os purificadores de aire eliminan o 99.97% das partículas transportadas no aire, con todo, os filtros non eliminan pequenos microorganismos patóxenos, como a gripe.

Podemos usar solucións UVC no sistema de purificación de aire ou no sistema de condutos de climatización comercial.


How to use UVC light

All in all, UVC light can indeed kill viruses and bacterial if we choose the right system for specific applications.


Artigo relacionado: A guía do comprador final sobre a compra de lámpadas UV


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