Lighting efficiency under mesopic photometry conditions

Abstract

The influence of spectral light distribution of light sources on effectivity of road lighting systems in twilight conditions photometry was considered in the paper. An experiment was carried out to investigate different spectral power distributions. One aim was to verify that S/P increases with increasing color temperature. Next aim was to clarify situation with the need to reviewing the actual lighting norms in Ukraine considering the results of researches indicates that light with a higher scotopic/photopic (S/P) ratio would be more effective in street lighting systems as they would be perceived as brighter at the same power.