The additional control components and sensors required for offices with daylight and presence control have already been integrated into master luminaires. The potential for realisable savings with energy-efficient lighting control is verifiably over 50 percent on average. In the case of the UE installation variants, universal means: can be used for ceilings with visible T-rails, concealed symmetrical rail constructions and cut-out ceilings. The UA designation refers to the surface-mounted version with matching mounting frame. Both for axis dimensions of 625 x 625 and 600 x 600 mm. A variety of wattages, optics and dimmable versions document the universal character in lighting technology.