Hidden behind a 'velum' of a metal grid spanned with transparent material, Optec floodlights evenly brighten the vertical surfaces. Combined with the filtered daylight from high above, this gives rise to a much more favourable contrast in the room than with conventional overhead lighting.

An additional glazed level forms a 1.40m high false ceiling. This can be heated to compensate for lower temperatures in winter and also serves as a location for technical installations. The lighting equipment is located here as well as the sensor-controlled, movable louvres for automatic regulation of the natural light.