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Lighting Concept
The larger part of the 700 square metres of exhibition space is situated on the upper storey of the museum. The upper galleries are equipped with a combined daylight/artificial light ceiling. Providing the in some cases extremely delicate exhibits with daylight first requires a suitable technology for controlling the quantity of light. The available daylight is subject to great fluctuations during the course of a day or indeed a year, and this should not be allowed to spoil the viewer’s enjoyment of the works. This problem must be weighed up against the outstanding richness of colour given by daylight under varying natural conditions. Moreover, the luminous efficacy of natural light is appreciably superior to that of artificial sources. All in all the decision for daylight saves an enormous amount of electrical energy that otherwise would be required for constant artificial illumination. The quantity of light can be controlled by electromechanically adjustable lamellae set beneath the glazed surface of the ceiling.
The exhibition spaces on the ground floor are lit solely by electrical sources, whereas upstairs this is only done when there is insufficient natural light. A major demand regarding the illuminated ceiling concerns the scattering and transmission of the light afforded by the employed materials. To this end the illuminated ceiling was specially optimized for the project in consultation with the manufacturer. The light is produced by high-efficiency T5/T16 fluorescent tubes (in the light colours 940 and 965) equipped with dimmable electronic ballasts. This allows the level of lighting to be adjusted as required for each separate space. On the upper storey, the artificial light can be individually added for each space according to the amount of daylight present.
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