Incorrect use and improper installation can lead to UV-C products restricting safety. Always follow the instructions in the operating manual. UV-C technology has been scientifically researched and described extensively. In comparison to UV-A and UV-B radiation, both of which are components of the sunlight hitting the earth, UV-C radiation does not penetrate very deeply into the skin due to the scattering that increases with shorter wavelengths. UV-C radiation is absorbed in the upper, mostly dead layers of the human skin. The maximum daily radiation of 253.7 nm wavelength to which a person should be exposed is 6 mJ / cm² over a period of 8 hours [American Conference of Governmental Industrial Hygienists. 2020 Threshold Limit Values and Biological Exposure Indices]. This UV exposure is comparable to a 10-minute bath in direct sunlight with a UV index of 10. Nevertheless, UV-C radiation can cause temporary skin and eye irritation as well as redness. Long-term exposure to UV-C radiation can cause burns, so when operating ultraviolet disinfection lamps, there should NOT be people, animals or plants in the rooms to be disinfected. This is comparable to the change in material properties when these objects are exposed to direct sunlight. After the application of UV-C lamps for disinfection in closed rooms, the corresponding room must be ventilated for approx. 10 minutes. Several safety precautions are integrated in the UV-C disinfection lamps to largely exclude improper use and minimise the risk of injury.