Due to different visual tasks and gaze patterns, the discomfort glare experienced by pedestrians may differ from that experienced by drivers. This paper investigates the discomfort glare experienced by pedestrians under various urban LED luminaires through psychovisual experiments conducted on a test track. The ability of state-of-the-art models to predict the level of discomfort glare, measured on the de Boer rating scale, for this application is also investigated. With one exception, the models all overestimate the mean subjective discomfort glare compared to the experimental data. Models proposed by Lin et al (2015) and Bullough et al (2008Bullough et al ( , 2011 perform well. However, the implementation of these models is not straightforward because choices are needed to estimate some of the variables such as the background luminance and the glare source area.

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The reflection properties of the road pavement depend on the material and the texture of its surface. They can be specified with a set of luminance coefficients, which can be measured thanks to a gonioreflectometer. We presented in a previous paper a gonioreflectometer designed for in-lab measurements, especially suited for public lighting applications. We present in this paper a metrological evaluation of this instrument. First, we compare measurements from the gonioreflectometer with measurements taken with an illuminancemeter and a luminancemeter. Then we look at measurements in two analytically tractable cases. Finally, we perform uncertainty calculations on the luminance coefficients, and extend the results to the road lighting application by calculating uncertainties on the lightness and specularity parameters. We also evaluate the influence of uncertainties on the performance of a given lighting design for two types of road surfaces. Our results indicate that the achieved uncertainties have a limited influence.

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