THE EFFECT OF ROAD LIGHTING LUMINAIRE SPECTRAL POWER DISTRIBUTION OVER LUMINANCE PERCEPTION CONSIDERING ROAD REFLECTANCE AND HUMAN EYE TRANSMITTANCE

摘要

In 2010 the CIE published a recommended system for mesopic photometry based on visual performance. According to this system, scenes illuminated at mesopic levels with lamps of high S/P ratio, will be perceived of greater brightness than those illuminated with lamps of a lower S/P ratio at equal photopic output. However, there could be other factors affected by SPD that, when are quantified, the final effect could be contradictory. The scope of this paper was to evaluate how luminance of road lighting installations is affected by the spectral road surface reflectance and by the human eye transmittance response, as people get older. Our results suggest that the benefits of considering the mesopic vision effect for luminaire sources with high S/P ratios are totally counteracted by the other two effects when photopic luminance of adaptation is between 1 cd/m~2 to 1.5 cd/m~2 for people between 20 and 60 years old, depending on the characteristics of the road surface.