The companies Licht im Raum, Dinnebier Licht and Lichtturm are a corporate group with tradition and history. Up to the present day it has evolved into one of the leading lighting design offices with a lamp collection, a manufactory and a showroom of its own. Licht im Raum is responsible for marketing, sales and specialized trade. Dinnebier Licht stands for light planning, product development and manufacturing. Gräfrath's former water tower that today operates under the name of Lichtturm, serves as the showroom, think tank and training venue of the group. The corporation's top priority is the professional lighting design for public places like administrative buildings, churches and other public spaces but it also has a focus on illuminating private homes and producing the company's own collection of luminaires.