Use of an Imaging Luminance Measuring Device to Evaluate Road Lighting Performance at Different Angles of Observation

Greffier, Florian; Muzet, Valérie; Boucher, Vincent; Fournela, Fabrice; Dronneau, Romain

doi:10.25039/x46.2019.op75

Cited by 11 publications

(12 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As in [22], the stopping distance can be considered for observer positioning. Official documents from different countries present different stopping distances for a dry pavement and the same traffic, as centralized in Table 3 [23]. Considering these values, one can assume that the observer's position must be adjusted in order to be at a longer distance than the stopping distance for the speed limit of each road.…”

Section: The Influence Of Longitudinal Observer Position In Luminance Calculationmentioning

confidence: 99%

Average Luminance Calculation in Street Lighting Design, Comparison between BS-EN 13201 and RP-08 Standards

et al. 2021

View full text Add to dashboard Cite

This paper presents a study on the influence of the observer’s position in relation to the calculation surface. This is the initial observation of the research, respectively that the two standards consider the position of the observer differently. For these situations, two types of calculations were performed. For the first set of calculations, the software used was DIALux 4.13 as this software can perform calculations in line with the RP-08 standard. The second set of calculations was performed with a script that offers the possibility to change the observer’s position. The conclusion was that EN-13201 has a better approach, but both standards could be improved. The second case study refers to the influence of the longitudinal observer position in an average luminance calculation. If one considers RP-08 as a guideline for performing the calculations, the conclusions are that changing the distance from the observer to the calculation surface has absolutely no effect on the average luminance value. On the other hand, if European standards are used as a guideline, changing the distance (from the standardized 60 m, either closer to the calculation surface or further away) can influence the overall results in average luminance and uniformity. Taking into account the results of these two case studies, the conclusion is that both RP-08 and BS-EN 13201 should be updated so that the observer’s distance in relation to the calculation surface would be a variable dependent on the stopping distance calculated based on the speed limit of the road.

show abstract

Section: The Influence Of Longitudinal Observer Position In Luminance Calculationmentioning

confidence: 99%

Average Luminance Calculation in Street Lighting Design, Comparison between BS-EN 13201 and RP-08 Standards

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In the Greffier case study, 51 the impact of using observation angles of 2.298, 38, and 58 was studied with a mobile luminance camera. The luminance and uniformities were calculated according to the EN 13201 mesh grid, using the concept of a mobile observer proposed by Stockmar.…”

Section: Literature Review Regarding Geometrymentioning

confidence: 99%

“…(a) Example of a luminance image taken with a luminance camera. The areas corresponding to different angles of observation are shown 51. (b) Corresponding luminance measured with the concept of a moving observer49,51 …”

mentioning

confidence: 99%

Review of road surface photometry methods and devices – Proposal for new measurement geometries

Muzet

Bernasconi

Iacomussi

et al. 2020

Lighting Research & Technology

View full text Add to dashboard Cite

Specifications concerning road lighting and photometry of road surfaces were established more than 50 years ago. Road lighting design and road marking visibility were developed for vehicle driving. The observation distance defined by standards corresponds to interurban applications; however, within Europe these areas do not tend to be lit. The objective of the SURFACE project is to propose new geometries for the photometric characterisation of pavements, both adapted to different urban travel modes and new lighting technologies. This article reviews the available guidelines, standards, measuring devices and literature regarding geometries and road lighting applications, and presents the project SURFACE analysis and proposal. The SURFACE consortium recommends adding several new angles for different driving conditions and road users; 2.29° for urban environments and consistency with road marking standard, and 1° for extra-urban environment and consistency with previous geometries. A 5° angle, corresponding to 17-m viewing distance, could be an interesting compromise, suitable for urban driving at low speed, cycling and for scooters. The angles of 10° and 20° are under consideration for describing the boundary between diffuse and specular behaviour.

show abstract

“…This implies characterizing the pavement reflection properties from angles other than the conventional 1 • . It also implies adapting the methodology for dimensioning and measuring the performance of a lighting installation by systematizing the use of luminance [27,28]. For the classical calculations at 1 • , the observer is fixed and located 60 m in front of the calculation zone [9,29].…”

Section: Introductionmentioning

confidence: 99%

“…Using a fixed observer would therefore mean considering that the pavement reflection properties are the same at 2.23 • , at 10 • , and for all angles between these two values. This does not seem realistic, and it becomes necessary to consider the concept of a moving observer as defined in [28,31]. It allows the distance between this observer and the calculation points to always be the same and thus use only the r-table measured at the studied observation angle.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pavement Heterogeneity and Observation Angle on Lighting Design: Study with New Metrics

et al. 2021

Self Cite

View full text Add to dashboard Cite

Optimization of lighting installations should be a priority in order to reduce energy consumption and obtrusive light while providing optimal visibility conditions for road users. For the design of lighting installations, it is assumed that the road has homogeneous photometric characteristics and only one viewing angle is used. There are often significant differences between the design of lighting installations and their actual performance. In order to examine whether these differences are due to the photometry of the road, this study proposes metrics to assess the influence of road heterogeneity and observation angle. These metrics have been used on many measurements conducted on site and in the laboratory for different pavements. A calculation engine has been developed to realize road lighting design with several r-tables in the same calculation or for different observation angles. Thus, this study shows that a root mean squared deviation (RMSD) calculation, including average luminance and uniformities associated with different r-tables, is directly correlated to a normalized root mean squared deviation (NRMSD) calculation between these r-tables. With these proposed metrics it is possible to optimize lighting installation while taking into account different types of urban surfaces and the diversity of users.

show abstract

Use of an Imaging Luminance Measuring Device to Evaluate Road Lighting Performance at Different Angles of Observation

Cited by 11 publications

References 2 publications

Average Luminance Calculation in Street Lighting Design, Comparison between BS-EN 13201 and RP-08 Standards

Average Luminance Calculation in Street Lighting Design, Comparison between BS-EN 13201 and RP-08 Standards

Review of road surface photometry methods and devices – Proposal for new measurement geometries

Influence of Pavement Heterogeneity and Observation Angle on Lighting Design: Study with New Metrics

Contact Info

Product

Resources

About