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Facade luminaires take on important functions in urban spaces: illuminated vertical surfaces contribute significantly to the spatial impression of squares, street axes and buildings. From the point of view of perception psychology and design, facade lighting is thus an important element in urban night lighting. Facade luminaires create grazing light, and optionally with uplight, which emphasises the surface structures of the facade. Facade luminaires are available with different downlight distributions: With wide distribution, facade luminaires alongside walls or buildings illuminate with high uniformity and over a large area, so that only a minimum number of luminaires is required. The narrow distribution is ideal for illuminating squares or terraces.