Abstract
This paper presents analysis of lighting quality in different road surface conditions using the DIALux software. Dry and wet road surfaces are used to study lighting quality by following classifications of the International Commission on Illumination (CIE). Lighting quality of high pressure sodium (HPS) and light emitting diode (LED) luminaires are compared, based on roadway with a traffic island. Results indicate that the HPS luminaire can provide better average illuminance and average luminance values than the LED luminaire, resulting in positive visual performance. However, the LED luminaire can achieve visual and comfort performance including energy saving due to its light distribution efficiency. For lighting quality on different road surface conditions, the lighter dry road surface materials, the higher lighting quality. Wet road surfaces cause very bright areas on road surface alternating with large dark areas. It results in the average luminance of the surface increased while overall uniformity decreased.
Highlights
The important role of road lighting systems is visibility maintenance of road users at the night time equal to the daytime
Road surfaces are classified into classes with their specular factor S1 value, which is determined according to the CIE [2]
Roadway lighting quality from comparing between high pressure sodium (HPS) and light emitting diode (LED) luminaires, including dry and wet road surface conditions based on R and W classes of the CIE are analyzed
Summary
The important role of road lighting systems is visibility maintenance of road users at the night time equal to the daytime. Moretti et al [4] claims that the lighter colour of a road surface is better visibility for drivers It gives a reduction in power consumption needed to achieve the minimum illumination requirements in comparison to conventional road surfaces i.e. asphalt pavements. An aggregate of cement or asphalt surfaces is primarily used to make the roadway [7], leading to road surface properties complying well with the CIE standard. Sędziwy et al [9] study different aspects of roadway lighting energy efficiency using LED technology and smart lighting systems. Roadway lighting quality from comparing between HPS and LED luminaires, including dry and wet road surface conditions based on R and W classes of the CIE are analyzed. The DIALux software is used to calculate road lighting parameters, namely average illuminance, average luminance, overall uniformity, and threshold incremental
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