Assessment of public lighting systems considering mesopic vision

Grando, Fabrícia de Oliveira; Ghisi, Enedir

doi:10.1016/j.jclepro.2020.123369

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…Results could also suggest that the participants did not relate the lighting attributes as being relevant in the current lightscape or that alternative attributes need to be defined. Although the analysis of this study was divided to reduce the impact of perception in two different light scenarios, as it is important to consider that visual adaptation to the different lighting conditions would have contributed to participants perceptions of the outdoor spaces, as they moved from photopic vision at the start of the walk to mesopic vision at sunset, 1,28 no clear differences were observed on participants’ responses for both lightscapes’ quality.…”

Section: Discussionmentioning

confidence: 99%

Exploring relationships between soundscape and lightscape perception: A case study around the Colosseum and Fori Imperiali in Rome

Flores-Villa

Oberman

Guattari

et al. 2023

Lighting Research & Technology

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Recently, there has been a growing interest to implement a holistic approach to study perception in urban settings with historic value, in which environmental factors such as acoustics and lighting play an important role. However, little research has addressed sound and light in combination. In this exploratory field study, a soundscape and lightscape protocol was implemented to gather both objective and subjective data. In all, 46 people joined a group walk around the historical sites of Colosseum and Fori Imperiali in Rome. Participants assessed the soundscape and lightscape quality via questionnaire at four locations, immediately before and after the sunset in April 2021. Acoustic parameters (A-weighted equivalent sound level, loudness, sharpness, roughness) and lighting parameters (luminance, colour rendering index and correlated colour temperature) were measured at each location while participants filled in the questionnaire. While there was little variation in the acoustic parameters measured before and after the sunset walks, changes were observed in perceptual data about the soundscape. These outcomes reveal a potential effect of lighting conditions on soundscape perception.

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Section: Discussionmentioning

confidence: 99%

Exploring relationships between soundscape and lightscape perception: A case study around the Colosseum and Fori Imperiali in Rome

Flores-Villa

Oberman

Guattari

et al. 2023

Lighting Research & Technology

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“…Because of this, the International Commission on Illumination (CIE) proposed, in 2010, an adjustment of the photopic luminance value, indicated by the manufacturer, to an effective luminance value [14]. This line of work serves as reference for numerous scientific publications [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Adjustment of Lighting Parameters from Photopic to Mesopic Values in Outdoor Lighting Installations Strategy and Associated Evaluation of Variation in Energy Needs

et al. 2021

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The sensitivity of the human eye varies with the different lighting conditions to which it is exposed. The cone photoreceptors perceive the color and work for illuminance conditions greater than 3.00 cd/m² (photopic vision). Below 0.01 cd/m², the rods are the cells that assume this function (scotopic vision). Both types of photoreceptors work coordinately in the interval between these values (mesopic vision). Each mechanism generates a different spectral sensibility. In this work, the emission spectra of common sources in present public lighting installations are analyzed and their normative photopic values translated to the corresponding mesopic condition, which more faithfully represents the vision mechanism of our eyes in these conditions. Based on a common street urban configuration (ME6), we generated a large set of simulations to determine the ideal light point setup configuration (luminance and light point height vs. poles distance ratio) for each case of spectrum source. Finally, we analyze the derived energy variation from each design possibility. The results obtained may contribute to improving the criterion of light source selection and adapting the required regulatory values to the human eye vision process under normalized artificial street lighting condition, reaching an average energy saving of 15% and a reduction of 8% in terms of points of light required. They also offer a statistical range of energy requirements for lighting installation that can be used to generate accurate electrical designs or estimations without the necessity of defining the exact lighting configuration, which is 77.5% lower than conventional design criteria.

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Comparison of energy efficiency and costs related to conventional and LED road lighting installations

Davidović

Kostić

2022

Energy

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Assessment of public lighting systems considering mesopic vision

Cited by 4 publications

References 15 publications

Exploring relationships between soundscape and lightscape perception: A case study around the Colosseum and Fori Imperiali in Rome

Exploring relationships between soundscape and lightscape perception: A case study around the Colosseum and Fori Imperiali in Rome

Adjustment of Lighting Parameters from Photopic to Mesopic Values in Outdoor Lighting Installations Strategy and Associated Evaluation of Variation in Energy Needs

Comparison of energy efficiency and costs related to conventional and LED road lighting installations

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