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Bolehkah sinar UVC membunuh virus dan bakteria?

Masa: 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.

Seterusnya, kami akan menerangkan secara terperinci what UVC lights are, how they work, their precautions for use and some commercial applications untuk menolong anda memperoleh pemahaman yang jelas.


uvc light sterilization


Wha is UVC light?


As we all know, Sunlight is a mixture of light energy at different wavelengths.


The wavelengths range from 380 nanometers (nm) to 780 nanometers (nm) are called visible light, while those beyond the range of wavelength are called invisible light.

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 to 400 nm

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

  • UV-B: 280nm to 320nm

It can treat skin diseases. But too much exposure will cause sunburn and even skin cancer. And only less than 2% of UVB can reach the earth.

  • UV-C: 200nm to 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

The shorter the wavelength, the stronger the energy, but the weaker the penetration, the faster the disappearance.


Function of UVC light

Pengetahuan Berkaitan: Lampu UV mana yang terbaik?

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.

And the market valuation even increased from 140,000,000 US dollars to an estimated 500,000,000 US dollars.

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.


Sekiranya dos UV tidak mencukupi, sebilangan virus hanya akan kehilangan aktiviti buat sementara waktu, dan kemudian perlahan-lahan memperbaiki strukturnya sendiri.


  • 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.

Inilah sebabnya mengapa kita perlu menggunakan pembawa yang serupa dengan lampu disinfeksi ultraviolet untuk mencapai pembasmian kuman.


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.

Oleh itu, jangan mudah mempercayai pepatah beberapa syarikat "kita boleh membunuh virus & bakteria", kadang-kadang itu hanya bahasa pemasaran.

Kita harus sedar bahawa hanya kecekapan, masa dan kos yang menjadi faktor utama dalam pilihan lampu UV kita.


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) Lampu pembasmian kuman ultraviolet tradisional besar (sekurang-kurangnya tinggi 40cm atau lebih tinggi), kecekapan rendah. Sumber cahaya LED 1W pada dasarnya dapat merangkumi ruang seluas hanya 1 meter persegi.


(2) Sumber cahaya dari kebanyakan lampu disinfeksi ultraviolet mengandung merkuri, yang buruk bagi lingkungan dan kesihatan jika dilepaskan.

(3) Sebilangan besar lampu disinfeksi ultraviolet adalah lampu spektrum luas termasuk UVC, UVA, dan UVB, yang cenderung menghasilkan ozon, yang menyebabkan gejala seperti keletihan, batuk, sesak dada, mual, dan kehilangan ingatan.


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.


Dengan ukuran ini, ia dapat digunakan dalam banyak peralatan mudah alih dengan fungsi pembasmian kuman:

(1) Permukaan


Permukaan yang tercemar seperti bilik dan peralatan hospital, ruang tamu, lapangan terbang, dan hampir semua tempat awam atau barang peribadi.


(2) Air


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.

Kita boleh menggunakan penyelesaian UVC dalam sistem pembersihan air atau sistem tandas.


(3) Udara


Pembersih udara menyingkirkan 99.97% zarah-zarah bawaan udara, namun, penapis tidak membuang mikro-organisma patogenik kecil, seperti influenza.

Kita boleh menggunakan penyelesaian UVC dalam sistem pembersihan udara atau sistem saluran penghawa dingin komersial.


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.


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