Special light sources are used for disinfecting rooms, which kill pathogens by their action. Most often they can be found in medical institutions, but in light of recent events, many people buy them even at home. The most common and well-known of these devices are quartz lamps, even the process of disinfection is often called "quartz treatment".

Why is "ultraviolet" so dangerous for bacteria and germs?
Ultraviolet radiation is electromagnetic radiation, whose wavelength ranges from 10 to 400 nm. In fact, it is radiation whose spectrum lies between the light visible to the human eye and X-rays. Ultraviolet has the ability to penetrate the DNA and RNA of microorganisms and destroy them, at least - spoil them, significantly slowing down or stopping the reproduction of cells altogether.
As early as 1906, mercury-based discharge lamps were used to produce powerful radiation in the desired spectrum. There was only one problem - as it turned out, the glass of an ordinary lamp transmits light visible to our eyes, but does not pass ultraviolet. For a long time, this problem could not be solved until they thought of using quartz instead of glass, which perfectly passes through the UV spectrum. Quartz lamps were widely used in hospitals during World War I and are still in use today.
For humans, exposure to high doses of UV can cause dangerous damage to the eyes and skin, so people are not allowed in the room during disinfection. In therapeutic doses, on the contrary, weak UV radiation is used to treat diseases such as rickets and helps the bodies of people lacking sunlight to produce the necessary vitamins and substances.