Launch of the ARTHELIO project: the combined use of daylight and artificial light in a light pipe system — The TU Berlin (Technical University, Institute of Electronics and Lighting Engineering, Professor Dr. Kaase and Dr. Rosemann) collaborated with Semperlux AG and with Italian and Swedish partners to develop a lighting system based on a hollow light guide. Daylight and artificial light provided by a sulphur lamp are fed into the light pipe, the aim being to reduce energy consumption and enhance user comfort. The Arthelio prototype, which is installed in the Semperlux central administration building, provides energy-efficient lighting. At the same time, it improves the quality of the atmosphere in the windowless stairwell at Semperlux headquarters. — Semperlux receives the Berlin Environment Award. — Changes on the Executive Board: In 2000, Ulrich Misgeld takes over as Financial Manager of Semperlux.