Comparison of road lighting calculations with measurements using conventional and camera luminance meters

Istanbul Technical University (ITU) and Istanbul Transportation Communication and Security Technologies Inc. (ISBAK) with the support of Ministry of Science Industry and Technology (MOSIT) are carrying out a common project to develop a road lighting automation system with an ability of dimming luminous flux of the luminaires according to the traffic speed and flow. Before establishing such a system, where the road lighting levels change dynamically, we need to make visibility calculations under different road lighting scenarios. Visibility calculations are based on luminance measurements. The process of road lighting luminance measurements are time consuming if a conventional luminance meter is used since it can only perform point-by-point measurements. On the other hand, a camera luminance meter captures the luminance of the entire calculation field on the road scene which speeds up the measuring process. To find an easy way to make luminance measurements under many different road lighting scenarios, it is considered to use a camera luminance meter. In this study, a comparison of road lighting calculations with measurements using conventional and camera luminance meters are made and measurement results are given.