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Xenon (HID) technology is one of the mile-stones in developing process of car lighting. The first step was to combine this technology with free-form reflector technology. The result was a high performance dipped beam beam-pattern with three times more light output compared to a halogen system. The next step of improvement is “Bi-Xenon”. It makes sense to use the enormous light output of a Xenon light source for two light functions (Main beam and dipped beam) in a single pocket headlamp system. This leads to new lighting performance and design freedom in headlamp technology. In this paper the technological aspects of system realization will be described. New solutions in lighting strategy including modern actuators which handle optical elements to switch between two light functions had to be found.

HELIOS is a program for calculation, simulation and analysis of lighting problems expecially designed for car lighting technologies. Base is an “experiment” in which optical elements and theire features are described. Example: The reflector is defind by CAD-data and the surface is reflective. The result of simulation will be a light distribution. The performance has to be analysed. The LDE gives us the possibility to analyse light distribution strategies before calculation of the reflector surface itself. It is a “virtual light world”. This reduces developing time and costs and gives a help to find the best technical solution for complex illumination problems.