What is UV-C?

Views: 0     Author: Zayn     Publish Time: 2022-04-15      Origin: https://www.suntechleds.com/


1. What is UV-C?

2. What is UV-C LED?

3. UV-C LED Vs Traditional Mercury Vapor Lamp

4. UVC LED VS  LED Power Conversion and Price Trends

5. The Applications of UV-C LED

6. Advantages of UVC LED

7. Germicidal UVC LED Strip-Suntech

8. FAQ

1. What is UV-C?

UV (ultraviolet) light may be a sort of radiation which will be found within the spectrum and is measured in nanometers(nm). Human eyes can see visible light, but not ultraviolet light.

UV model

There are three sorts of UV rays: UV-A, UV-B and UV-C:
UV-A has the longest wavelength, ranging from 315nm to 400nm.
UV-B is known as medium wavelength, ranging from 280nm to 315nm.
UV-C has the shortest wavelength, ranging from 200nm to 280nm.

The shorter the wavelength, the greater the damage and the less penetration. Conversely, the longer the wavelength, the smaller the damage and the greater the penetration.
Among the three types of UV rays, UV-C has a germicidal effect, which can be effectively used to kill microorganisms. When the DNA of microorganisms absorbs UV light, the UV light prevents the microorganisms from replicating, preventing them from multiplying. Bacteria and viruses are often disinfected with UV-C light. 

The main difference between UVC,UVA and UVB is sterilization function. Then best feature of UVC is able to sterilize.

2. What is UV-C LED?

UV-C LED is light-emitting diodes (LEDs) that emit photons in the UV-C range at wavelengths that are composed of multiple layers of substrate material. In the case of sterilization, the optimal wavelength is between 260nm and 270nm. AS the wavelength increases, the sterilization effect decreases exponentially.

3. UV-C LED Vs Traditional Mercury Vapor Lamp

UV-C LED performs the same functions as traditional mercury vapor lamps, but it offers many advantages over traditional mercury vapor lamps. 

UV-C LED has the same sterilizing power but has a longer lifespan and is safer for the environment. 

New technologies and innovations have created more UV-C LED products to inactivate bacteria and viruses.

To help people better understand the differences between UV-C LED and conventional mercury lamp, let's look at a summarize table first to learn the advantages between UV-C LED and conventional mercury lamp:

Table 1  differences between UV-C LED and conventional mercury lamp -SuntechLED



Conventional mercury lamp


10000 hours

5000-15000 hours

on/off cycles

Unlimited cycling

Max 4 per day

Warm-up time


Up-to 15 minutes

Mercury content



Wavelength selection




Environmentally friendly






Small design footprint



Power supply

6-30V DC 


4. UVC LED VS Power Conversion and Price Trends

To get a better understanding of UVC LED VS blue LED power conversion and price trends, lets take a look of the table 2.

Table 2 UVC LED VS blue LED power conversion and price trends -Suntech

price and trend

Historical trends of performance: shown are power conversion efficiency(left axis) and price(dollars per optical watt, right axis) for blue and UV-C LEDs. The latter trail the former by approximately 20 years, but recent breakthroughs in UV-C transparent epitaxial structures now entitle UV-C LEDs to begin to follow a similar rate of progress as for blue LEDs in the 2000s. (See endnote, a complete set of references for this illustration will be provided in the online publication of the article.)

(1) Prediction of UVC price trends in the next 10 years

In the next decade, between 2020 and 2030, the price of UVC LED will increase, its technology tends to mature and humans use it not only for sterilization, but also for water disinfection, air disinfection, and surface disinfection.

(2)The changing trend of UVC power conversion in the next 10 years

At present, the main reason why UVC LED cannot completely replace the sterilizing ultraviolet mercury lamps for medical use is that the illumination of UVC LED is still not strong enough. 

To achieve the same sterilization effect as mercury lamps, a larger number of LEDs or more time will be required.  

For professional medical units with high frequency of use and a large range of sterilization spaces, it is not cost-effective to use UV LED for disinfection at this stage. 

In the next ten years, the UVC LED will be developed in the direction of high power, which will promote more energy efficiency.

5. The Applications of UV-C LED

Suntech led offers UVC LEDs for a variety of applications and uses. Our UV LEDs effectively eliminate harmful bacteria, fungi and viruses. Below are some of the most common applications our products can be used for

(1) Germicidal (UVGI) purification

UVC LED can be used for sterilization and purification in residential, commercial hygiene, healthcare, transportation, life sciences and defense. 

For example, it can be used in home appliance faucet dental catering service. By affecting bacterial DNA, the number of bacteria is suppressed, reducing the number of bacteria in the environment.

UV-C Air Purifier

(2) Air Purification

UV-C LED is used to disinfect air bateriaca. Air purification refers to providing sterilization and disinfection, dust reduction and haze removal, removal of harmful decoration residues and odors for various indoor environmental problems. 

This improves living and office conditions, and enhances physical and mental health. Indoor environmental pollutants and pollution sources mainly include radioactive gases, mold, particulate matter, decoration residues, second-hand smoke, etc.

UVGI Virus Killing

(3) Surface Sterilization

UV-C LED is used to disinfect surface bateriaca. For the sterilization and disinfection of the surface of objects, ultraviolet sterilization technology has a good effect. 

The advantage of ultraviolet disinfection lies in its efficient and broad-spectrum sterilization, and the disinfection effect is proportional to the irradiation dose and time. However, due to the straight line of light, the stacking of object surfaces during disinfection will block the ultraviolet light, and the sterilization and disinfection effect is not obvious in places where the ultraviolet light cannot be irradiated. Therefore, ultraviolet rays can be combined with ozone and drying when sterilizing object surfaces.

(4) Water Disinfection

UV-C LED is used to disinfect drinking water from source to consumption. In the UV-C model, the water can take a few seconds to become clean water and the new technology allows the UV-C LED to be placed in different positions to ensure decontamination. 

They emit powerful UV-C photons in the 200-280nm range through the water, preventing bacteria in the water from multiplying.

water disinfection

(5) Hospital Sanitization

UVC LED can be used for sterilization in wards, such as pediatric wards, obstetrics and gynecology wards, infectious disease wards, which reduce cross-infection and speed up patient recovery. In the infectious disease ward, UVC LED is installed at the entrance for long-term exposure to form an ultraviolet door, and ultraviolet led is used to sterilize the ventilation openings to prevent the spread of bacteria to other areas and cause cross-infection.


To know the applications of uvc led in different areas, let s look at the table 2. After it, you must know how it used in our life.

Table 2. Applications of UV-C LED-Suntech LED

Market segment


Air sterilization, household water, tableware, clothing, bedding, bathroom products


Aseptic workshop, bacteria room in pharmaceutical factory, food processing workshop in food factory, storage room

Healthy care

Ward sterilization, sterilization of infectious disease clinic.


Classroom sterilization, library reading room


Subway stations, carriages, underground passages, food sterilization and other occasions with poor air flow

6. Advantages of UVC LED

(1) Ultraviolet sterilization is fast and efficient. As shown in Table 4. when the UV intensity is 30000μW/cm2, bacteria, viruses, mold spores, algae and fish diseases can be killed within a few seconds. In addition, some literature also pointed out that the killing rate of Staphylococcus aureus on the infected bacteria carrier was 100% when irradiated with an LED ultraviolet lamp at a vertical position of 2-5 cm for 5 minutes; The killing rate of E. coli reached 100%; J. L. Clancy et al believed that when the ultraviolet radiation dose was 30J/m2, the inactivation rate of Cryptosporidium could exceed 99.9%.

(2) Ultraviolet rays have an effective inactivation effect on almost all bacteria and viruses. Table4 shows 10 common bacteria and viruses including Escherichia coli, Aspergillus niger, influenza virus, and hepatitis B virus. It can be seen that ultraviolet rays have a good inactivation effect on the listed bacteria and viruses.

(3) The operation of ultraviolet sterilization is stable. Because the process of sterilization and detoxification is physical, it will not produce additional harmful by-products and affect human health.

Table 3  The bactericidal efficiency of ultraviolet light on common germs -SuntechLED

Kill object

Time (s)


Bacillus anthracis


Clostridium tetani


Dysentery bacilli


Escherichia coli


Staphy lococcus











Poliovirus 1


Hepatitis B virus


7. Germicidal UVC LED Strip-Suntech

Germicidal UVC LED strip for Sterilization & Disinfection UV strip light Product parameters: UVC LED tape features: 1. With wavelength 265nm-278nm , the UVC strip light can damage DNA, destroying harmful micro-organisms in other liquids, on surfaces, on food.

wavalength of UV

Germicidal UVC LED Strip265nm-278nm, besides UVC, we also do UVA and UVB products.

Please click on the images in the table below to view product details.

Table 4 UV-C products from SuntechLED-suntechLED




Radiant flux

Radiant flux

Dimension L*W*H(mm)

Germicidal UVC LED Bar Module

uvc bar moudule




250nm 254nm 255nm UVC Disinfection LED Module





UVC Disinfection LED Module


air surface




UVC LED Bulb 265nm 275nm Germicidal Light

UVC LED Bulb 265nm 275nm Germicidal Light




Germicidal UVC LED Strip

Germicidal UVC LED Strip




High Power UVC LED Chip

High Power UVC LED Chip


380.87 mW


Deep UVC LED Chip Diode


254nm 255nm

10mw ~ 15mw


Far UVC Led Chip Strip Light


207nm 220nm 222nm



Far UVC Led Light 

Far UVC Led Light






Far UVC 222nm LED Tube Light 


Far UVC 222nm LED Tube Light




8. FAQ

(1) UVC and UVGI?

UV-C is a short wavelength but powerful germicidal and virucidal radiation.

The use of UV-C as a method of killing viruses, bacteria and mold is called UVGI. Ultraviolet germicidal radiation (UVGI) is a method of using short wavelength UV-C light to disinfect and kill bacteria. UVGI can be used to disinfect surfaces, air and water. And it poses less risk to human health. 

(2) UVC and HAVC?

HVAC is an effective tool for eliminating pathogens and improving indoor air quality (IAQ) with UVC fixture systems.

UV C is a part of  HVAC system.

(3) Do LED UV lamps work?

Yes. it can kill bacteria and viruses.

(4)Is UV C light visible?

No, it s unvisinle. It only is tested by machine.

(5) Do UV-C air purifiers work?

Yes. It uses wavelengths to stop bacterial DNA from replicating and purifies the air.

(6)Are UV C lamps in air purifiers safe?

Yes. This is safe because it is an emerging sterilization technology.

(7) Will UV C kill viruses?

Yes. Ultraviolet rays can kill viruses. The principle of ultraviolet sterilization and disinfection is to destroy the molecular structure of DNA deoxyribonucleic acid and RNA ribonucleic acid in the cells of microorganisms, resulting in the death of growing cells or regenerative cells to achieve the purpose of sterilization and disinfection. 

(8) How long does it take for UVC light to kill bacteria?

This is determined by the energy and intensity of sterilization.  Refer to table 4.

(9) Will UV C Lights Kill Mold?

Yes. It works the same as killing bacteria.

(10) Is UV C light harmful to the human body?

No, as long as you leave the room after turning him on, don't be him and stay in this room tired is not harmful to the body.

(11) Why is UVC the most dangerous?

Because according to the wavelength principle, the longer the wavelength, the smaller the damage, and the shorter the wavelength, the greater the damage, and it is the smallest.

(12) Is it worth investing in germicidal LED lights?

Yes. It is worth because the cost of using more advanced technology in the market is relatively low, and then the use is relatively wide.




UVC articles you may be interested in:


Disinfection & Sterilization Standards of UV Products Application


Frequently Asked Questions About UVC


Top 10 Things to Know Before Buying a UV Black Light LED Strip


UVA UVB and UVC Radiation - Everything You Need to Know


Knowledge and application of UVC ultraviolet rays



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