METAHEURISTIC OF ARBITRARY LUMINOUS INTENSITY DISTRIBUTION FOR ROADWAY LIGHTING LUMINAIRES

The introduction of light-emitting diodes (LEDs) for roadway lighting necessitated a completely new approach in the optical design of lighting systems. The small Light Emitting Surface (LES) of the Solid-State Lighting (SSL) sources enables precise and robust optical control. While for illuminance-based lighting scenarios, the desired light pattern is deduced through the inverse-square law, for the perceived luminance-based calculations, the combined effects of multiple light points make the problem statement for the design objective definition challenging. This research paper presents an original theoretical and practical method for generating a luminous intensity distribution for fulfilling the lighting requirements of luminance-based lighting classes. The results showed that designing optical surfaces to achieve this generated luminous intensity distribution is leading to better task efficiency (often over 10 % power saving potential at same wattage compared to Taguchi method) in shorter computation times. Therefore, the method is desirable for roadway lighting optical design and has a prospect in gaining a better understanding of night-time roadway safety.