It is difficult to estimate the influence of sunlight on a person; under its action, the most important physiological and biochemical processes are triggered in the body.
The solar spectrum is divided into infrared and visible parts, and the ultraviolet part, the most biologically active, has a great influence on all living organisms on our planet. Ultraviolet radiation is the shortwave part of the solar spectrum that is not perceived by the human eye, which has an electromagnetic character and a photochemical activity.
Due to its properties, ultraviolet light is successfully used in various areas of human life. UV radiation has been widely used in medicine because it is able to change the chemical structure of cells and tissues, exerting various effects on humans.
Of the full spectrum of ultraviolet rays, only those with short wavelengths, UV-C type, have a strong germicidal effect destroying pathogenic microorganisms such as all types of: bacteria, viruses (including coronaviruses), molds, mites, being so very has long been one of the most effective methods of disinfecting or sterilizing water, air and surfaces.
This technology dates back more than 100 years, and was demonstrated and described in a scientific paper from 1878 by Arthur Downes and Thomas P. Blunt. In fact, in 1903, the Nobel Prize in Medicine was awarded to Niels Finsen for the successful use of short UV-C light against bacteria that cause tuberculosis.