Daylight detectors are light sensors. They are comprised of a number of photocells and an infrared sensor assembly as an additional presence detector. They thus capture data on the entire weather situation and, after analysing the data, adjust the anti-glare shielding (blinds) and the brightness of the artificial lighting to make maximum use of the daylight available, normally – as far as the lighting is concerned – by constant light regulation. Each daylight detector is generally assigned an area where weather and daylight situation impacts are the same at all points, e.g. separate detectors cover the east, south and/or west facade of a building.