For single luminaires and for groups of luminaires there is a “Rotation” tab. The illustrations show the difference between the application for a “whole field” and for “single luminaires”. Entries in the first line will rotate the whole luminaire arrangement around their common central axis. This is for adjusting the luminaire arrangement, for example, in sloping roof situations. Entries in the second line leave the luminaires in their existing position but tilt them around their individual centre of gravity of the luminaires. In this way the luminaires can be tilted on sloping ceilings so that they are nevertheless aligned vertically.