1972 - 1978 setup and director engineering HL-Technik AG
1978 - 1982 executive shareholder of Lichtplanung (Lighting Design) Chr. Bartenbach GmbH
1982 - 2008 Lichtplanung (Lighting Design) Ulrich Werning (später Werning Day & Light)
Partially at the same time:
1990 - 1997 setup and director lighting design section of HL-Technik AG
Since 01/2009 partner of Day & Light Lichtplanung GbR