The office rooms are usually 4 m in depth with the windows providing sufficient daylight. The lower section of the internal blinds provides glare protection; the upper section directs the light via the ceiling, which is partially plastered in white, into the room. Despite the deep floor plan of the building, the inner glass walls allow the central zone to be partially lit with daylight. On average, 7.5 W/m² electrically connected load of the lighting system is installed for each storey, excluding desk lighting. The workplaces can thus be illuminated by up to 500 lux. The profile system of the lights contains uplights for indirect lighting and specular louvres as downlights. The lights are all equipped with dimmable electronic ballasts. A control unit with a central sensor on the roof and light meters under the ceiling either dims the artificial light or switches it off completely, depending on the daylight. It is also possible to adjust the blinds and the lighting locally. In rooms without daylight, for example, a lavatory or technical room, there is a presence detector.