The largest ZKW site with more than 3,000 employees is located in Wieselburg in Lower Austria. Since 1954, the Wieselburg plant has primarily produced headlamps and lighting modules. Wieselburg is the nucleus of innovation because research and development have a particularly high priority at ZKW.

In Wieselburg, research is not only carried out on the latest lighting technologies, but numerous patents are also successfully registered internationally every year. In addition, the company has state-of-the-art measurement technology and tests new products in its own light channel in Wieselburg, which is one of the largest ones in Europe.