Under daylight conditions the window surfaces appear dark. At night, illuminated interiors provide a strong contrast between the dark facade surface and bright windows. Floodlights produce uniform light distribution over the facade. Illuminating the window embrasure accentuates the frame of the facade opening, whereas narrow-beam uplights emphasise the facade's grid pattern.

Indoor users should not be dazzled. Luminaires shining into the interior impair the view out of the building. Lighting control systems can be used to control the light in individual rooms and to create patches of light on the facade.


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