The quantitative lighting criteria are paramount considerations for lighting usable areas. Direct illumination here is considerably more economical than indirect illumination.

General lighting for
- workshops and shopfloors
- museums
- exhibitions
- sales and representational areas

Preferred luminaire groups
- downlights

Reichstag, Berlin

Bank of China, Beijing

ERCO, Lüdenscheid

Ständehaus Kunsthalle, Düsseldorf