While the quality of the halogen light was the top priority in the more majestic areas of the building, the factors used to select the light sources for the stairway escape routes were completely different. The continuous operation of the luminaires meant that the lowest possible energy consumption was of great importance. At the same time, it was essential to guarantee that the luminaires would function perfectly in direct current operation in case of a power failure. Lightcast downlights for compact fluorescent lamps fitted with electronic control gear meet all of these requirements.