Abstract
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.
Highlights
Introduction and BackgroundRoad lighting, known as public lighting, is lighting provided for the purpose of illuminating public roads, cycle tracks, footways and pedestrian movement areas within public parks and gardens, as defined by the International Lighting Vocabulary ILV [9]
Typical values of the road lighting energy performance indicators have been updated to reflect the current level of technology referred to the end of 2020, in a simplified and streamlined structure
The results showed that in the span of the last seven years, the performance is biased to slightly better figures, the gain is not that significant for Power Density Indicator (PDI)
Summary
Known as public lighting, is lighting provided for the purpose of illuminating public roads, cycle tracks, footways and pedestrian movement areas within public parks and gardens, as defined by the International Lighting Vocabulary ILV [9] This public service provided to the residents and visitors of cities, towns, villages and other settlements has to simultaneously fulfil various functions, such as good visual conditions closely related to traffic safety, personal safety and assurance [10], safety to properties, visual performance at amenities other than those used for transportation, and not of less importance, is its contribution to increasing the attractiveness and enjoyment of the urban environment in the evenings. Auxiliary lighting classes HS (HS1 to HS4) accounting for the hemispherical illuminance (and its uniformity), EV (EV1 to EV6) for the vertical illuminance, and SC (SC1 to SC9) taking into account the semicylindrical illuminance can enhance the quality of lighting in some specific applications
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