Residents’ perceptions following retrofitting of residential area outdoor lighting with LEDs

Kuhn, Linda; Johansson, Maria; Laike, Thorbjörn; Govén, Tommy

doi:10.1177/1477153512464968

Cited by 25 publications

(25 citation statements)

References 26 publications

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“…In Northern European countries in particular, it has been found that whiter or cooler light from light emitting diode (LED) light sources reduces the perceived pleasantness of lighting and its comfort quality [42,43]. Nevertheless, the adoption of modern smart designs and energy-efficient LED light sources could yield annual energy savings of about 41-76% [44]. While these energy savings have attracted considerable interest [43], research on the impact of a transition to LED-based lighting applications has primarily focused on energy reduction and the environment rather than users' experiences of such lighting.…”

Section: Outdoor Lighting and Urban Walkingmentioning

confidence: 99%

Improved Usability of Pedestrian Environments After Dark for People with Vision Impairment: an Intervention Study

Mattsson

Johansson

Almén³

et al. 2020

Sustainability

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Walking is an important transport mode for sustainable cities, but the usability of pedestrian environments for people with impaired vision is very limited after dark. This study compares the usability of a walkway, operationalized in terms of (i) the pedestrian’s ability to orient themselves and detect infrastructure elements, and (ii) the perceived quality of lighting in the environment (evaluated in terms of the perceived strength quality and perceived comfort quality). The study was performed in a city in southern Sweden, along a pedestrian route where observations and structured interviews had previously been conducted and after an intervention involving installing new lighting systems with LED lights. A mixed method analysis involving participants with impaired vision (N=14) showed that the intervention generally improved the walkway’s usability: observations indicated that the participants’ ability to orientate themselves and detect infrastructure elements increased, and the interviews showed that the intervention increased the perceived strength quality of the lighting along the walkway. However, the effects on the perceived comfort quality were unclear. It is therefore important to carefully evaluate new lighting systems to reduce the risk of creating an inappropriate lighting design that will limit walking after dark by people with impaired vision.

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Section: Outdoor Lighting and Urban Walkingmentioning

confidence: 99%

Improved Usability of Pedestrian Environments After Dark for People with Vision Impairment: an Intervention Study

Mattsson

Johansson

Almén³

et al. 2020

Sustainability

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“…The light distribution of the spherical half-sphere can be described with great accuracy by analytical dependence: (1) where: I m -means the maximum luminous intensity directed along the axis of the LED, γ-the plane angle that defines any direction in relation to the axis of the LED.…”

Section: Photometric Characteristics Of a Semi-spherical Ledmentioning

confidence: 99%

Visual and photometric consequences of using semi-spherical LEDs in diffuser shades

Żagan

Krupiński

2019

ELECTROTECHNICAL REVIEW

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The article presents and analyzes the observed phenomenon of optical deformation of a cylindrical dispersing diffuser as the effect of a classical replacement a light source by LED retrofit. A cylindrical diffuser equipped with such a light source presents a luminance distribution that significantly deviates from the actual view of the unshielded lampshade. This is a feature which disqualifies such an application of these sources for aesthetic reasons, the more so because the accompanying effect is also a noticeable deformation of the cylindrical shape. In the article, apart from the analysis of the phenomenon, the equation of the diffuser profile was presented, which using the discussed type of LED source could realize an even distribution of luminance on the surface. Streszczenie. Artykuł przedstawia i analizuje zaobserwowane zjawisko deformacji optycznej klosza cylindrycznego, rozpraszającego jako efektu zastąpienia klasycznego, źródła światła przez retrofit LED. Cylindryczny klosz rozpraszający wyposażony w takie źródło światła prezentuje rozkład luminancji, który znacząco odbiega od rzeczywistego widoku niezaświeconego klosza. Jest to cecha dyskwalifikująca taką aplikację tych źródeł z powodów estetycznych, tym bardziej, że efektem towarzyszącym jest również zauważalna deformacja kształtu cylindrycznego. W artykule, poza analizą zjawiska przedstawiono równanie profilu klosza, który przy zastosowaniu omawianego rodzaju źródła LED realizował by równomierny rozkład luminancji na powierzchni (Konsekwencje wizualne i fotometryczne stosowania półsferycznych ledówek w kloszach rozpraszających).

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“…Perceived outdoor lighting quality has been studied in an environmental psychological approach, e.g., [100,101] and is assumed to describe feelings of visibility and recognition, which are important aspects of feeling safe and non-threatened. However, perceptions of LED lighting compared with traditional light sources have not been studied explicitly in environmental psychology, but see Nikunen et al [102].…”

Section: Human Healthmentioning

confidence: 99%

New Framework of Sustainable Indicators for Outdoor LED (Light Emitting Diodes) Lighting and SSL (Solid State Lighting)

Jägerbrand

2015

Sustainability

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Light emitting diodes (LEDs) and SSL (solid state lighting) are relatively new light sources, but are already widely applied for outdoor lighting. Despite this, there is little available information allowing planners and designers to evaluate and weigh different sustainability aspects of LED/SSL lighting when making decisions. Based on a literature review, this paper proposes a framework of sustainability indicators and/or measures that can be used for a general evaluation or to highlight certain objectives or aspects of special interest when choosing LED/SSL lighting. LED/SSL lighting is reviewed from a conventional sustainable development perspective, i.e., covering the three dimensions, including ecological, economic and social sustainability. The new framework of sustainable indicators allow prioritization when choosing LED/SSL products and can thereby help ensure that short-term decisions on LED/SSL lighting systems are in line with long-term sustainability goals established in society. The new framework can also be a beneficial tool for planners, decision-makers, developers and lighting designers, or for consumers wishing to use LED/SSL lighting in a sustainable manner. Moreover, since some aspects of LED/SSL lighting have not yet been thoroughly studied or developed, some possible future indicators are suggested.

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Residents’ perceptions following retrofitting of residential area outdoor lighting with LEDs

Cited by 25 publications

References 26 publications

Improved Usability of Pedestrian Environments After Dark for People with Vision Impairment: an Intervention Study

Improved Usability of Pedestrian Environments After Dark for People with Vision Impairment: an Intervention Study

Visual and photometric consequences of using semi-spherical LEDs in diffuser shades

New Framework of Sustainable Indicators for Outdoor LED (Light Emitting Diodes) Lighting and SSL (Solid State Lighting)

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