The Science of UV Disinfection

Pathogen Control using UVC

UV or Ultraviolet is a form of electromagnetic radiation with a wavelength that is shorter than that of visible light and invisible to the naked human eye.

UVC, a sub band of Ultraviolet light has proven germicidal capabilities and offers an eco-friendly and effective solution to inactivate microorganisms such as bacteria, viruses, mold & fungi efficiently and effectively.

The high energy associated with the UVC light due to its short wavelength (254nm), when absorbed by the RNA and DNA of the microorganisms damages their nucleic acids and inactivates them. These changes caused in the RNA and DNA structures render the microorganism incapable of performing vital cellular functions including replication. This is key to stopping the spread of infection and disease.

Even the “Superbugs” that have developed a strong resistance to antibiotics have no defence against UVC light.

A Brief History of UV

Ultraviolet light was discovered by Johann Wilhelm Ritter in 1801 after his observation on invisible light that beyond the optical region of the electromagnetic spectrum, it darkened silver chloride. Ritter split sunlight with a prism and measured the relative darkening of the chemical as a function of wavelength. The region just beyond the optical violet region produced the most darkening and hence was eventually called ‘ultra’ violet.

How UV Works?

Unlike other disinfection methods, UVC light disinfection offers an eco-friendly and effective solution to inactivate microorganisms in a hassle-free approach. 

The germicidal range of UV shown in the attached graph peaks at 265nm. VIOlight UVC devices use low-pressure mercury-arc continuous UVC lamps that generate over 90% of its energy at 254nm.  This radiation is very close to the peak of the germicidal effectiveness curve of 265nm, the most lethal wavelength to microorganisms.

Pathogen Control
Pathogen Control


UVC can help prevent COVID-19 transmission by reducing contamination. UVC light has proven to be very effective in inactivation of at least two other coronaviruses that are near relatives of the COVID-19 virus: SARS-CoV-1 and MERS-COV. The International Ultraviolet Association (IUVA) has published its findings on COVID-19, based on the existing research. 

Research conducted by Cornell University has confirmed the effectiveness of UVC light on COVID-19 coronavirus