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What is UV-C light?
How does UV-C light deactivate pathogens?
Does UV-C light reduce the risk of transmitting SARS-Cov 2 virus?
How to check the effectiveness of UV-C light?
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The way to fight against viruses and bacteria

Germany, Eschborn


200 - 280 nm


280 - 320 nm


320 - 400 nm


400 - 780 nm

Visible light

What is UV-C radiation?

Ultraviolet germicidal radiation (UVGI) is a portion of the naturally occurring ultraviolet radiation from solar energy. It is completely absorbed by the ozone layer and does not reach the earth's surface. The current ability to emit UVGI comes only from artificial light sources.


Von allen Strahlungsarten hat UV-C (zwischen 200 und 280 nm) die stärkste Wirkung auf biologische Materialien. So kann UVGI wirksam zur Desinfektion und Dekontamination von Luft und Oberflächen eingesetzt werden, um die Ausbreitung schädlicher Infektionserreger zu verhindern.

How does UV-C inactivate pathogens?

The radiation is naturally absorbed by micro-organisms such as viruses, bacteria and moulds. When UV-C radiation enters the micro-organism, the cell's DNA bonds are broken.

This process changes the inherent characteristics of the cell so that the micro-organism can no longer reproduce. By destroying the organism’s ability to reproduce, it is completely harmless as it cannot colonise, and the micro-organism population quickly decreases.

UV-C light deactivates viruses, fungi and bacteria

List of bacteria, viruses and fungi from research by Dr. W. Kowalski on the effectiveness of UV-C in deactivating pathogens.

Fungi and other microorganisms

• Acinetobacter baumannii
• B. atrophaeus (B. globigii)
• Bacillus anthracis spores
• Bacillus subtilis
• Burkholderia cepacia
• Corynebacterium diphtheriae
• Escherichia coli
• Francisella tularensis

• Haemophilus influenzae
• Halobacterium sp. NRC-1
• Legionella dumoffi
• Legionella bozemanii
• Listeria monocytogenes
• Micrococcus candidus
• Mycobacterium bovis BCG
• Mycoplasma arthritidis

• Neisseria catarrhalis
• Proteus vulgaris
• Pseudomonas aeruginosa
• Salmonella enteritidis
• Sarcina lutea
• Shigella paradysenteriae
• Staphylococcus albus
• Streptococcus agalactiae

• Adenovirus
• Bacteriophage MS2
• Coliphage X-174
• Coronavirus
• Coronavirus (SARS)
• Coxsackievirus
• Human Cytomegalovirus
• Influenza A virus

• Newcastle Disease Virus
• phage phi 6
• Poliovirus
• Poliovirus type 1
• Rauscher Murine Leukemia v.
• Rous Sarcoma virus (RSV)
• Sindbis virus
• S. aureus phage

• S. aureus phage
• Vaccinia virus

• Acanthameoba castellani
• Aspergillus amstelodami
• Aspergillus flavus
• Aspergillus fumigatus
• Blastomyces dermatitidis
• Botrytis cinerea
• Candida albicans
• Cladosporium herbarum

• C. sphaerospermum
• Cladosporium wernecki
• Cryptococcus neoformans
• Curvularia lunata
• Fusarium spp.
• Histoplasma capsulatum
• Monilinia fructigena
• Mucor mucedo

• Mucor spp.
• Penicillium chrysogenum
• Penicillium spp.
• Rhizopus nigricans
• Rhodotorula spp.
• Scopulariopsis brevicaulis
• Sporotrichum schenkii
• Torula bergeri

Kowalski, W., Ultraviolet Germicidal Irradiation Handbook, UVGI for Air and Surface Disinfection, wyd. Springer, Berlin, 2009

How to check the effectiveness of UV-C radiation?

We trust the world leader in photochromic indicator technology, INTELLEGO TECHNOLOGIES. With INTELLEGO's patented ink that measures UV-C radiation, dosimeters provide a simple way to monitor and evaluate the effectiveness of the decontamination process. Colour coding on the dosimeter card identifies the UV-C doses acting per mJ/cm2. The colour-changing UVC dosimeters make it easy to validate any UV-C device and provide real-time visible evidence of successful UVGI.