The AIC shown in Figure 1(left) is particularly interesting for applications with comparably deep office rooms due to its potential to lead daylight deeply into the room through the highly reflective light-duct (“core-daylighting”). The office rooms within the LESO-SEB are, however, comparably short (i. e. only 4 m of room depth). The AIC has therefore been adapted to these office rooms’ geometry. The new solution is shown in Figure 1(right): the system has basically been reduced to

one single anidolic collector element, located underneath the tilted double glazing. This collector element reflects the entering daylight flux onto the room’s diffuse white ceiling, from where it is distributed throughout the entire office. Altherr and Gay have compared the performance of this ADS to that of a normal double glazing [7]. They showed that this system has two great advantages compared to a normal vertical window:

1) The system blocks out large parts of the direct daylight flux that would reach the room’s window section through a normal vertical window. It therefore reduces the illuminance levels in this area. This corresponds to massive glare reduction and improved visual comfort for occupants working next to the windows.

2) The blocked daylight is not rejected but rather reflected towards the room’s diffuse white ceiling. From there, it is distributed comparably evenly within the room. The results are higher daylight factors in the centre and rear sections of the office room compared to the “normal vertical window”-case.