Experimental assessment of color-rendering indices and color appearance under varying setups

Fumagalli, Simonetta; Bonanomi, Cristian; Rizzi, Alessandro

doi:10.1080/09500340.2014.952694

Cited by 5 publications

(4 citation statements)

References 14 publications

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“…In view of this problem, many researchers have provided new color rendering evaluation methods considering: Color Quality Scale (CQS) [44], Gamut Area Index (GAI) [45], CRI2012 [46], etc. Some researchers have made a series of comparisons of these methods [47][48][49]. These methods have made some improvements to CRI, but also have some limitations, as they measure the color rendering from different perspectives (color matching, fidelity, quality, preference, memory, etc.).…”

Section: Color Rendering Iindex Evaluationmentioning

confidence: 99%

The Impact of LED Color Rendering on the Dark Adaptation of Human Eyes at Tunnel Entrances

Zhao

Dong

Chen

et al. 2020

IJERPH

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The dark adaptation of drivers’ eyes at a tunnel entrance seriously affects traffic safety. This can be improved by the design of tunnel lighting. Light-Emitting Diode (LEDs) have been applied as a new type of luminaire in tunnel lighting in recent years, but at present, there are few studies on the influence of color rendering of LEDs on tunnel traffic safety, and there is no explicit indicator for the selection of appropriate color rendering parameters in tunnel lighting specifications, which has aroused researchers’ concern. In this article, several new color rendering evaluation indexes were compared, and as a result, it is considered that CRI2012 (a color difference-based color rendering index) is more suitable for evaluating the color rendering of LEDs used at tunnel entrances. The dark adaptation phenomenon was simulated in the laboratory. Four CRI2012s, three color temperatures and eight colored targets were used in the experiments. The results showed that yellow, silver and white can provide shorter reaction times, while red and brown lead to longer reaction times, which can provide a reference for the design of road and warning signs at tunnel entrances. The effect of target color on reaction time was greater than that of color rendering. Under most target colors, the higher the CRI2012, the shorter the reaction time. When designing the color rendering of the LEDs at a tunnel entrance, the value should thus be as large as possible (close to 100), and a lower color temperature value (about 2800 K) should be selected. This paper provides technical support for tunnel lighting design and a reference for tunnel lighting specifications, which is of significance to improve driving safety and avoid traffic accidents in highway tunnels.

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Section: Color Rendering Iindex Evaluationmentioning

confidence: 99%

The Impact of LED Color Rendering on the Dark Adaptation of Human Eyes at Tunnel Entrances

Zhao

Dong

Chen

et al. 2020

IJERPH

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“…As of the time of writing, this is the internationally agreed method. Note that CRI and associated technology have also been covered in [14]. The two most widely quoted colour rendering terms are: R a -the general colour rendering index, based on the colour shifts of the eight principal test colour samples; and R 9 -the 'special' (individual) index for the highly saturated red colour (sample 9).…”

Section: Colour Rendering Indexmentioning

confidence: 99%

Artificial Intelligence in Light-Source Design

Soltic¹,

Chalmers²

2019

Computer Architecture in Industrial, Biomechanical and Biomedical Engineering

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The advent of light-emitting diode (LED) light sources has led to a new freedom in the design of light-source spectra, and it is now possible to optimise for different source performance parameters, which is the principal aim of the authors' work. LEDs and lasers are real or potential light sources, and are inherently monochromatic, that is, narrow-band sources, with typical optical bandwidths in the range 20-40 nm (nanometres) for LEDs and 1-5 nm for diode lasers. Mixtures of three or more can be used to produce nominally white light of the type acceptable for general purpose lighting. It is a characteristic of all types of sources that there is a trade-off between good colour properties and high efficiencies, and the methods described here are directed towards an optimum combination of such parameters. This chapter will explain the use of differential evolution (DE) as a highly effective heuristic approach to optimisation, and proceeds to explain the structure and operation of a DE algorithm designed as an optimisation tool for such purposes.

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“…As of the time of writing, this is the internationally agreed method. Note that CRI and associated technology has also been covered in (2). The two most widely-quoted colour rendering terms are: R a -the general colour rendering index, based on the colour shifts (caused by the test source) of eight CONTACT Snjezana Soltic ssoltic@manukau.ac.nz https://protect-us.mimecast.com/s/_-UhCL9YPoHRMMX36CqkKgV?domain = docs.google.com moderate-chroma colour samples; and R 9 -the 'special' (individual) index for the highly saturated red colour (sample 9 in the CIE system).…”

Section: A Brief Lighting Backgroundmentioning

confidence: 99%

“…Average differences in source colorimetry data, from Table 3: CCT −1 = 2.02 MK −1 ; E' uv = 0.001. Note that colour temperature differences are conveniently represented in recipro cal-megakelvin differences (also known as 'mired' or 'micro-reciprocal-degrees') 3 , calculated using Equation (2).…”

Section: A Previous Examplementioning

confidence: 99%

Prospects for 4-laser white-light sources

Soltic

Chalmers

2018

Journal of Modern Optics

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This paper describes a series of simulation experiments designed to demonstrate the feasibility of using solid-state lasers in white-light mixtures. The mixed-laser sources are evaluated in terms of the luminous efficacy of the radiation (LER) as well as different measures of colour performance. The latter include the CIE colour rendering index (R a) and the IES colour fidelity index (R f) as well as a selection of additional parameters in the two systems. Optimization of the mixtures is achieved by the use of purpose-designed differential evolution algorithms. The best results to date (with four real laser wavelengths) are R f of 84 with LER 364 lm/W, which indicate the feasibility of the mixed-laser approach to provide highly efficient, energy-saving light sources. These prospects will be further enhanced by potential future developments in semiconductor lasers, with the possibility of producing R f of 86 with LER of 380 lm/W.

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Experimental assessment of color-rendering indices and color appearance under varying setups

Cited by 5 publications

References 14 publications

The Impact of LED Color Rendering on the Dark Adaptation of Human Eyes at Tunnel Entrances

The Impact of LED Color Rendering on the Dark Adaptation of Human Eyes at Tunnel Entrances

Artificial Intelligence in Light-Source Design

Prospects for 4-laser white-light sources

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