At night, the dramatic lighting of the spectacular room and its high-quality materials comes to the fore. Spotlights on the eaves add lighting accents, while grazing light emphasises the vertical lines. Low-voltage halogen lamps are used to bring out the true colours of surfaces such as the interior facade of Oregon Pine.

The lighting designers from a-g Licht in Bonn have grappled with the lighting design of the atrium both under daylight and twilight conditions. To make optimum use of the daylight the interior façade is stepped. The floor of the perimeter gallery is made of white translucent glass elements and this is beneficial as additional light for the offices in the basement levels.