Lamp and system with wall-type radiation fields for preventing or minimising the spread of pathogens in indoor air

The invention relates to a system for preventing or minimising a spread of viruses and to the prevention or minimising of the spread of viruses in indoor air with one or more radiations sources (10) in a room, which divides the room into smaller segments using UV-C light walls, and with a sensor assembly for detecting a movement or the presence of one or more people (P) in the room, and comprising a controller (16) which is designed to at least partially switch the one or more radiation sources (10) on or off according to at least the presence of the person (P). According to the invention, the one or more radiation sources (10) are designed to generate a wall-type radiation field (10b), which acts as a UV-C wall, so that the room or rooms are divided into smaller room segments which prevents or minimises a spread of viruses, given that the viruses are deactivated by the UV-C light, and the controller (16) is designed to at least partially switch off the relevant radiation source (10) if the movement data detected by the sensor assembly indicates a possibility that one of the people (P) would like to cross the relevant radiation field (10b).