How does UV-light work?

UVC light is a effective and well-documented method for disinfection. UV light makes it possible to inactivate most microorganisms such as bacteria, fungi, yeast and virus.

UVC treatment is an effective form of disinfection in air, liquids, and surfaces. When UVC light reach the microorganisms and enters the cell, the DNA in the cells is destroyed, preventing the cell from reproducing. This prevents the cell from multiplying to an infection in a host.

The wavelength which ensures the best and most effective result of disinfection is about 264nm.



Works in all environments

UVC radiation of microorganisms is completely independent on pH, temperature or whether they are in solid, liquid, or airborne form. The important factor is that the light can reach the organism and it means that if a microorganism is hidden form the light, it can avoid radiation. However, unlike other disinfection methods, there are very rarely end products in any over – or under-exposure with UVC light.

The UVC light can be used as the only disinfection solution, but also works very well as a supplement to other techniques.

Our UVC systems can be installed in all types of environments and used in a wide range of applications in both industry and agriculture.


We are happy to help

If you need disinfection, but have not found the right the solution, call Tel. +45 22 680 680 or send us a message.

We are always ready to custom make a NATDIS solution exactly for your needs and desires, – with natural disinfection using UVC light.



Bacteria, viruses, and fungi

Here you can see a selection of the dose needed to neutralize organisms by 90-99,99%

MicroorganismDosage UV light in J/m2 to achieve 90% reductionMicroorganismDosage UV light in J/m2 to achieve 90% reduction
Bacillus anthracis - Anthrax45,2Vibrio comma – Cholera33,75
Clostridium tetani130,0Mucor racemosus A170,0
Corynebacterium diphtheriae33,7Penicillium roqueforti130,0
Ebertelia typhosa21,4Chlorella Vulgaris130,0
Escherichia coli30,0Paramecium110,0
Listeria Monocytes45,0Bacteriophage – E. Coli26,0
MRSA32,0Infectious Hepatitis58,0
Mycobacterium tuberculosis62,0Influenza34,0
Pseudomonas aeruginosa55,0Brewers yeast33,0
Pseudomonas fluorescens35,0Common yeast cake60,0
Salmonella enteritidis40,0Saccharomyces spores80,0
Salmonella typhimurium80,0


Inactivation of microorganisms with UV light is an exponential process. The higher the UV light exposure, the higher the proportion of microorganisms being inactivated. This means:

UV light exposure (dosage) required to inactivate 99% is twice the value for inactivating 90%.
UV light exposure(dosage) required to inactivate 99,9% is 3 times the value for inactiving 90%
UV light exposure(dosage) required to inactivate 99,99% is 4 times the value for inactiving 90%


Please contact us and find the exact dosage you need.


Ultraviolet Light

UV light belongs in the category of electromagnetic radiation. Other well-known types are X-ray, light, radio and television radiation. The only difference between these types of electromagnetic radiation types is the length of the waves. The shortest wavelength belongs to cosmic and X-ray radiation. A very long wavelength is associated with changing signals. Optical radiation is a very small sector. One of them is UV radiation. Visible and infrared radiation are examples of long wavelengths in this spectrum.

Ultraviolet is the part of electromagnetic radiation, which is delimited in the shorter wavelength with visible spectrum and the upper end of X-rays. The spectrum of ultraviolet radiation is between 100 and 400 nm and is invisible to the human eye.


When using the CIE classification, UV spectrum is divided into three types:

  • UVA (longwave) from 315 nm to 400 nm
  • UVB (medium wave) from 280 nm to 315 nm
  • UVC (shortwave) from 100 nm to 280 nm

There is a strong bactericidal and well-documented effect in UVC light. UV light is measured in watts (W) and the illumnation density is measured in watts per square meter (W/m²). To ensure bactericidal effect, dosage is important. Dosage is illumination density multiplied by time (t) in seconds and expressed in joules per square meter (J/m²). 1 joule is 1 watt-second.


Why use UVC as a disinfectant?

UVC lighting is an effective way to disinfect waterair, and surfaces, without adding or creating toxic effects. It is natural and the sun‘s radiation is an essential element in keeping the environment clean. Dosage and efficiency of artificial UVC lighting is a powerful light source, which ensures an environmentally friendly solution to disinfection. 

Want us to call you?

We are happy to give you a quote on how we can disinfect with UV light for your company or organization. We tailor our solutions, so fill in the name and phone number below, and we will call you and discuss your options.