Typical Values of Energy Performance Indicators in Road Lighting

Amongst many road lighting design criteria, energy performance plays an important role as it has a~direct link to operational costs, potential reduction of carbon dioxide emissions, mitigation of obtrusive light, and its impact on the night-time environment in urban and conurban settlements. The energy performance of road lighting is conveniently described by the pair of normative numerical indicators PDI and AECI established in European standards. This article aims to present typical values of these indicators for different combinations of road arrangements, road widths, lighting classes and light source technologies to illustrate what benchmarks can be expected using this assessment system. Objectives of the article also comprise discussion on factors influencing the energy performance and conclusion whether it is appropriate to introduce limiting value requirements and/or ranking systems to label energy performance of road lighting systems.