Kiến thức UVC

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Hướng dẫn cuối cùng cho người mua về việc mua Đèn UV của bạn

Thời gian: 2020-07 20-

Nowadays, UV light is popping up as the answer to killing viruses and bacteria. However, if we lack much enough knowledge of UV light, there will be more risks than benefits.

It can be quite daunting as there are so many UV Lamps on the market and they all have different features and descriptions.

Don't be overwhelmed! We understand that UV Lamp is an investment for you business so you want to be sure you are choosing the matching one to fulfill your need s and budget.

Therefore, we have supplied you with a comprehensive UV Lamps buying guide to help you make an informed decision.

 PART ONE: Ultraviolet Light

Q1. Tia cực tím là gì?

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 kind of electromagnetic radiation with a wavelength between 10 nanometers and 400 nanometers, which is shorter than visible light, but longer than X-rays, and cannot be detected by the human eye.


Although ultraviolet light is known for its disinfection function, for example, it can kill various microorganisms, but the actual efficacy of ultraviolet light depends on the wavelength range.

Q2. What are the differetn types of ultraviolet light?

UV-A, 320nm to 400 nm. It makes up the majority of UV reaching the Earth and 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. Only less than 2% of UVB can reach the earth.


UV-C, 200nm to 280nm. It is particularly good at sterilizing but te penetration ability is very weak. Before reaching the ground, all UVC will be absorbed by ozone in the atmosphere.


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

Q3. Why you should choose ultraviolet light?

There are several main advantages of using ultraviolet light for disinfection:

  • An effective disinfection method

Ultraviolet light is a fast and immediate type of disinfection where results can be seen within few minutes.

  • No chemicals needed

No chemical residue is left behind after the application of ultraviolet light, without life-threatening chemicals.

  • No hazardous by-product

Ultraviolet light disinfection is a chemical-free activity which adds up nothing other than ultraviolet light, thus no by-product is formed.

  • Không độc hại

The ultraviolet light disinfection is a physical one and secure for use on food. 

Q4. What are the precautions when using ultraviolet light?

Humans are at risk if they are exposed to ultraviolet light even for a short time. The intensity of harm depends upon the exposure time, the intensity and wavelength of ultraviolet light. The following are guidelines:

(1) Use filters, lenses, eyewear, and gloves

(2) Sử dụng closed beam paths of ultraviolet light

(3) Use a cover to close the beam when the ultraviolet light source is not in use

(4) Never look straight at the ultraviolet light

(5) Tránh đến những khu vực đang sử dụng ánh sáng cực tím

(6) Bảo vệ của bạn skins by covering them and decrease the exposure time

Related Knowledge: Tại sao tia cực tím được sử dụng để khử trùng?

Q5. What are the features of UVA sterilization?

With the longer wavelength, UV-A has weaker energy. Therefore, it can't kill virues and bacteria alone.


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


Through the photocatalyst, an oxidation-reduction chemical reaction occurs. All carbon-based organisms, including bacteria, viruses, smoke, formaldehyde, pollen, mites, etc, will be disintegrated into H2O & CO2.

Q6. What are the features of UVB sterilization?

UV-B light can be filtered and can not propagate through glass materials.


People suffering from a shortage of Vitamin D and high blood pressure can exposure to the UV-B to lower their blood pressure.


The favorable features of UV-B waves can be used to protect human beings from infection and treat few skin problems.


However, It has neither strong energy nor strong penetrating ability, so it has little help in sterilization.

Q7. What are the features of UVC sterilization?

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.


However, UV-C can not discriminate between the human body and viruses, bacteria, and will cause harm to the human body.


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

Kiến thức liên quanĐèn UV nào tốt nhất?

Q8. How does UVC light kill viruses & bacteria?

UVC works by destroying 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.


Scientific research found that UVC can use very little time to finish the disinfection process and make most microbes reduction up to 99.99%.


Based on this information, UVC lights are believed to be effective at killing viruses & bacteria. 

Q9. Can we be disinfected by sunshine?

You may be wondering if we stand under the sunlight containing UVC, 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 lights will be filtered out by ozone in the atmosphere.


Đây là lý do tại sao chúng ta cần sử dụng một chất mang tương tự như đèn khử trùng tia cực tím để đạt được khử trùng.

Q10. Can UVC light kill all viruses immediately?

Please pay attention to the fact that the vitality of different viruses and bacteria are different. Some bacteria&viruses may be injured once they are exposed to UVC, while others are not.


Nếu liều UV không đủ, một số virus sẽ chỉ tạm thời mất hoạt động, và sau đó từ từ sửa chữa cấu trúc của chính chúng.


At present, there are no specific figures to show how much UV dose is needed to kill different viruses & bacteria.


But one thing is certain, that is, the sterilization effect is a combination of ultraviolet energy and irradiation time.


Kiến thức liên quan: Can UVC light kill the viruses and bacteria?

Q11. Is Far-UVC light (222nm) safe?

More scientists have proved that UVA, UVB and UVC can cause damage to human skin and eyes, and even lead to cancer.


The latest experiment shows that 222nm Far-UVC may be safe for human health. Because its penetration is very weak and can only reach the surface skin. However:


1. The research on 222nm Far-UVC is still in the experimental stage and far away from commercial application. There is no clinical trial data to prove its safety.


2. UVC LED chip with 222nm Far-UVC is still in the stage of small-batch production and we cannot use this chip for mass production.


3. The cost of UVC LED chip with 222nm Far-UVC is too high to be affordable.


Kiến thức liên quanIs Far-UVC light (222 nm) efficient and safe?


 PART Two: Ultraviolet Lamps

Q12. What are the main UV lamps on the market?

On the market, there are four main products taking UV as core competence:


UV Mercury Lamp, popular for the low cost and high power but not suitable for family use. Because it was harmful for human health.


UVC Sterilizing Wand, has only a psychological comfort effect. Because the bacteria will only temporarily lose activity, and then slowly repair structure with insufficient UV dose.


UVC Sterilization Box, is a more suitable application due to the confined space. But it can only sterilize small objects.


UV Air Disinfection Solutions can meet all conditions and is a huge market ignored by everyone.

Related knowledge: Tại sao hầu hết các loại đèn diệt khuẩn UV trên thị trường không hiệu quả?

Q13. What are the advantages of UV mercury lamp?

UV Mercury lamps are more energy-efficient than incandescent and most fluorescent lights. The other advantages are high intensity, clear light output.


For these reasons, they are used for large area overhead lighting, such as in factories, warehouses, and sports arenas as well as for streetlights.


UV mercury lamps are economical and largely admired by the general public. They are used commonly in the industrial and commercial levels and are considered as one of the most reliable forms of lighting.

Q14. What are the disadvantages of UV mercury lamp?

Đèn UV thủy ngân nguy hiểm cho con người vì:


  • Contain mercury

 Mercury has a wide range of acute health effects, including harm to the nervous system, immune system, and gums. According to the Minamata Convention on Mercury, China will not produce and sell such lamps since 2021.


  • Induce Ozone

185nm ultraviolet light of mercury lamps can change O2 in the outside air to O3, which will result in dizziness and nausea affect health.


  • Waste energy

UV mercury lamp needs a long start-up time.


The better applications for UV Mercury Lamps are industry levels, such as sports ground and factories.


Kiến thức liên quanCó nên mua đèn UV Mercury không?

Q15. What are the advantages of UV sterilizing wand?

The stuff we use every day like the computer, bed, desks, and kitchenware is a harbor for germs cause the surfaces are touched and re-touched by hundreds of people.


Luckily, UV sterilizing wand can clean surfaces such as sofas, beds, bathtubs, towels, cushions, carpets, and keyboards and reduce surrounding bacteria.


The outstanding advantage is light and portable, which can be easily placed in a handbag, backpack, or suitcase. No matter where you are, you can meet the sterilization requirement at any time.

Q16. What are the disadvantages of UV sterilizing wand?

At first, the amount of UVC light required for sterilization is around 40 millijoules per square centimeter, and it is almost impossible to get in a hand-held little device.


Secondly, UVC does not work well in corners and crevices because it is the spectrum of visible light, and if light cannot enter, it will not produce the same effect.


Thirdly, UV sterilizing wand requires someone to hold it. If the device can destroy the virus, then it can also harm you.


In summary, even if the UV sterilizing wand is functional, their disadvantages outweigh their use. 

Kiến thức liên quanShould I buy UV sterilizing wand?

Q17. What are the advantages of UV sterilization box?

UVC Sterilization Box is a more suitable application. Because it's the most cost-effective sterilization solution.


Dựa trên chi phí cao của đèn LED UVC và tốc độ phân hủy nhanh, hiện tại không thể đạt được khử trùng hiệu quả.


Nhưng nếu đèn LED UVC được đặt trong một không gian hạn chế, mọi vấn đề sẽ được giải quyết. Do sự phản xạ của ánh sáng, sự phân rã của UVC sẽ tương đối giảm. Và không gian hạn chế sẽ cho phép nhiều thời gian hơn cho quá trình khử trùng.


For example, we can put mobile phones, glasses, and even clothes in the UVC Sterilization box.

Q18. What are the disadvantages of UV sterilization box?

Although you take UVC light as an effective and instant solution, it cannot be denied that it still possesses limited strength.


For those areas where the ultraviolet rays are blocked by other objects, there is no sterilization effect at all.


Meanwhile, normal people have no way to distinguish products that use UVC rays versus other UV rays. Therefore, there are plenty of counterfeit UV consumer products on the market.


Moreover, the biggest advantage of UV sterilization box is that we can only sterilize small objects but not the entire room.

Q19. What are the advantages of UVLED+Photocatalyst?

In the whole sterilization, TiO2 has the bactericidal effect of photocatalyst under UVA irradiation. Not only can kill the virus, but also reduce the formaldehyde in the room.


For viruses not killed by TiO2, UVC can play a supplementary role. Because UVC only provides auxiliary functions and does not require so much energy, it reduces a lot of costs and makes it acceptable to most companies and people. 

Q20. What are the disadvantages of UVLED+Photocatalyst?

For most LED lamps, the L70 lifespan is more than 50,000 hours. That means, after using 50,000 hours, the lumen will decay to 70% of the original data.


But in the field of UVC LED, it's difficult to reach the same technology level, because the industrial development has not been matured.


Especially the best application scenario for UVLED+Photocatalyst technology is air sterilization, which has high requirements for the LED lifespan due to the long period of high-intensity operation.


Therefore, few manufacturers can meet the demand.

 PART THREE: UV Air Sterilization

Q21. What is the principle of UVLED+Photocatalyst?

The photocatalyst is a general term for photo-semiconductor materials with photocatalytic function represented by nanometer TiO2 (titanium dioxide).


Coating it on the surface of the substrate, under the action of ultraviolet light, can cause organic or inorganic substances to undergo oxidation-reduction reactions.


Then it can effectively kill a variety of bacteria, and can decompose and harmlessly treat bacteria or fungi. It can also decompose some life odors caused by human activities.


In this process, the catalyst does not change itself or it is also not consumed in the chemical reaction, so the synchronization of the two processes happens. 

Q22. Why is UVLED+Photocatalyst the best sterilization option?

Để phát huy tốt hơn vai trò khử trùng của UVC, ngày càng có nhiều nhà sản xuất chú ý đến việc kết hợp chiếu sáng UVC và các đơn vị HVAC.


Tại sao? Bởi vì khử trùng không khí là ứng dụng tốt nhất của UVC cho đến nay. Chỉ có nó có thể đáp ứng các điều kiện sau đây:


1. Small & confined space

2. Thời gian hoạt động đủ dài

3. Làm việc với sự hiện diện của con người


Meanwhile, through repeated trials and experiments, we have developed an efficient and harmless sterilizing process, which is UVLED+Photocatalyst.


It is the air disinfection system applied for air heating and cooling system, with UV LED Strip & photocatalyst. It has a double effect on killing virus/ bacterial/ VOCs/ animals smelling immediately at a 99.93% killing rate.

Kiến thức liên quanCông nghệ khử trùng không khí bằng tia UV hiệu quả và hiệu quả vào năm 2020

Q23. Là gì Chất xúc tác quang TiO2?

Titanium dioxide is the naturally occurring oxide of titanium having the chemical formula TiO2, while a photocatalyst is a layering factor holding titanium dioxide as its energetic component.


An oxidation-reduction chemical reaction takes place when light is exposed to the photocatalyst substance. Air can be disinfected and purified using this chemical reaction.


Several properties like optical and electronic properties, efficient photoactivity, high chemical stability, low cost, nontoxicity (which means safety to the environment and humans), reusability, and eco-friendliness make TiO2 a strong candidate for photocatalyst process. 

Q24. Why choose TiO2 as a Chất xúc tác quang?

It is believed that the decomposing properties of TiO2 are known from the half-century. The problem was only in building the applications which seem to be solved now.


So, now the titanium dioxide can be used for air sterilization through various applications and one of them is UV lights.


It can decompose any pollutants and we all can see the increasing health problems in the world. So, climate change is real and so is the TiO2 for air sterilization.


Many experiments and researches are showing the results in favor and that is the reason we are firm for building various indoor and outdoor applications using it to clean the air from bacteria.

Q25. Can TiO2 cause cancer?

Some time ago, the European Union identified TiO2 as a category 2B carcinogen: May cause cancer to humans, there is insufficient evidence to prove carcinogenicity to laboratory animals, and insufficient evidence of carcinogenicity to humans.


The same category 2B except for " TiO2", there is also "coffee".


In fact, as long as humans are exposed to high-concentration (10mg/m3) of insoluble tiny particles for a long time, it may cause related diseases. But even those who are engaged in the production of TiO2, the concentration is only between 0.3mg/m3-6mg/m3.


What's more, when TiO2 is processed, it is firmly embedded in the molecular gap of the carrier (like air conditioning filter), and it can't run into the human lungs.


Therefore, please don't over-interpret the EU's carcinogen label for TiO2.

Q26. What is Organic LED?

An Organic LED (Light Emitting Diode) is also known as OLED or simply an Organic LED. It is a light-emitting diode (LED) in which the discharged electroluminescent layer is a film of an organic compound that emits light in response to an electric current.


The OLED emitter is the dominant ingredient in an OLED display. It is an organic material (made of Carbon) that radiates light when electricity is exerted. The fundamental formation of an OLED is an emissive coating, the middle between a cathode (which is infusing electrons) and an anode (which eliminates electrons).

Q27. What are the features of Organic LED?

  • Advantages of Organic LED

Organic LED has a great color rendering index (CRI), it is the ability to render actual colors of an object as compared to the natural light.

They are energy efficient or power-saving and cost-saving.

They are physically compact, easily portable.


  • Disadvantages of Organic LED

The constructing and assembling task of an Organic LED is very costly.

They are not water-proof so water or fluids can cause damage to them.

Therefore, please don't over-interpret the EU's carcinogen label for TiO2.

Q28. What is Inorganic LED?

Using crystalline semiconductor, Inorganic LEDs (also known as micro-LED) are manufactured, which are also light-emitting diodes (LEDs). The optical discharge wavelength can be determined by changing the configuration and composition of the substance. Germanium, gallium arsenide, gallium nitride, etc are some common materials used in this technology.


In contrast of organic LED, it is entirely packaged with inorganic materials.

Q29. What are the features of Inorganic LED?

  • Advantages of Inorganic LED

Inorganic LEDs are valued for their low energy utilization.

The lifespan of inorganic LEDs can be than 100,000 hours.

Inorganic LEDs are very delicate power electronics.

  • Disadvantages of Inorganic LED

After the evolution of Inorganic LEDs, the blueprint of lighting systems has been remarkably tangled and tricky.

These devices are also known as self-heating because they produce a lot of heat within the device due to the use of semiconductors.

Q30. How does the photodegradation of formaldehyde by TiO2?


Formaldehyde (HCHO) is one of the most common indoor pollutants.


Photocatalysis is an emerging and promising technology for indoor air purification by using TiO2 as a catalyst under the illumination of UV light, which can oxidize the VOCs into CO2 and H2O at room temperature and atmospheric pressure.


In order to remove HCHO efficiently, The TiO2/AC network film was prepared by loading nanometer particle TiO2 on the surface of activated carbon. 


The photocatalytic degradation of gaseous HCHO was performed by TiO2/AC network film under the irradiation of UV light. 


HCHO can be photocatalytic degraded on the surface of nanometer TiO2 under the illumination of UV light, during which the photo-production holes and electronics can react with the water molecules that adsorb on the catalyst surface to generate hydroxyl. 

 More information will continue to be updated...

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