High Quality Content by WIKIPEDIA articles! The Zumtobel Group (also known as Zumtobel AG)(WBAG: ZAG) headquartered in Dornbirn, Austria is a leading European manufacturer of professional indoor and outdoor lighting, lighting management systems and lighting components as well as LED and OLED technology. The Zumtobel Group includes the subsidiaries of Zumtobel, Thorn, Tridonic and Ledon. and ranks high among companies in professional luminaire and components business.