Kruithof's rule revisited using LED illumination

Viénot, Françoise; Durand, Marie-Lucie; Mahler, Élodie

doi:10.1080/09500340903151278

Cited by 93 publications

(75 citation statements)

References 33 publications

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“…82 Nineteen studies were considered to provide credible estimates of relative spatial brightness under lighting of different SPD (Table 1), these being four studies using matching, [1][2][3][4] five studies using discrimination, [30][31][32][33][34] and 10 studies using category rating 1,28,34,42,43,[45][46][47][48] including the second experiment in Boyce and Cuttle. 44 In 17 of these 19 studies, the test results suggest a significant effect of lamp spectrum on either illuminances needed for equal spatial brightness, or, significantly different ratings of spatial brightness at equal illuminances.…”

Section: Resultsmentioning

confidence: 99%

“…48 This may be for practical purposes, as small fields are easier to set up than real rooms, and it is easier to control extraneous variables such as spatial distribution to help ensure SPD is the only independent variable. Rea et al 84 used a field of size 188 Â 188 and their comment in discussion following the article reveals they considered this a satisfactory approximation of a large visual field.…”

Section: Characteristics Of the Visual Scenementioning

confidence: 99%

“…A comparison of the results of brightness and clarity evaluations, however, suggests that test participants give similar judgements for brightness and clarity when these are not defined in the test procedure. 73 It was concluded that 10 studies 1,28,34,42,43,[45][46][47][48] including the second experiment in Boyce and Cuttle 44 present credible evidence of SPD and spatial brightness using a category rating procedure. These studies tended to use a randomised or balanced sequence of stimulus presentation (or used independent samples), the number of stimuli did not greatly exceed the number of points in the response range and sufficient quantitative data are reported.…”

Section: Fotios and Housermentioning

confidence: 99%

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Lamp spectrum and spatial brightness at photopic levels: A basis for developing a metric

Fotios

Atli

Cheal

et al. 2013

Lighting Research & Technology

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Light sources are available in a variety of spectral power distributions (SPDs) and this affects spatial brightness in a manner not predicted by quantities such as illuminance. Tuning light source SPD to better match the sensitivity of visual perception may allow the same spatial brightness but at lower illuminance with potential reductions in energy consumption. Consideration of experimental design was used to review 70 studies of spatial brightness. Of these, the 19 studies considered to provide credible evidence of SPD effects were used to explore metrics for predicting the effect of SPD but did not provide conclusive evidence of a suitable metric, in part because of incomplete reporting of SPD characteristics. For future work, these data provide an independent database for validating proposed metrics.

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Section: Resultsmentioning

confidence: 99%

Section: Characteristics Of the Visual Scenementioning

confidence: 99%

Section: Fotios and Housermentioning

confidence: 99%

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Lamp spectrum and spatial brightness at photopic levels: A basis for developing a metric

Fotios

Atli

Cheal

et al. 2013

Lighting Research & Technology

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“…Under these conditions, pupil constriction can be attributed to amalgamated increases in excitation of the classical photoreceptors and mRGCs (e.g. Berman 2008;Vienot et al 2009). Alternatively, a monochromatic light of approximately 500 nm could be used to selectively stimulate mRGCs but this would stimulate classical photoreceptors and hence subsequently induce the perception of luminance and colour.…”

Section: Introductionmentioning

confidence: 99%

Contribution of human melanopsin retinal ganglion cells to steady-state pupil responses

et al. 2010

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The recent discovery of melanopsin-containing retinal ganglion cells (mRGCs) has led to a fundamental reassessment of non-image forming processing, such as circadian photoentrainment and the pupillary light reflex. In the conventional view of retinal physiology, rods and cones were assumed to be the only photoreceptors in the eye and were, therefore, considered responsible for non-image processing. However, signals from mRGCs contribute to this non-image forming processing along with cone-mediated luminance signals; although both signals contribute, it is unclear how these signals are summed. We designed and built a novel multi-primary stimulation system to stimulate mRGCs independently of other photoreceptors using a silent-substitution technique within a bright steady background. The system allows direct measurements of pupillary functions for mRGCs and cones. We observed a significant change in steady-state pupil diameter when we varied the excitation of mRGC alone, with no change in luminance and colour. Furthermore, the change in pupil diameter induced by mRGCs was larger than that induced by a variation in luminance alone: that is, for a bright steady background, the mRGC signals contribute to the pupillary pathway by a factor of three times more than the L-and M-cone signals.

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“…Lighting in florist shops can be varied to optimize esthetics for customers (Veitch, 2001;Viénot et al, 2009). Pinto et al (2008) determined that lighting that resulted in the best visual impression of art paintings was more white than the warmer lights normally used in museums.…”

Section: Discussionmentioning

confidence: 99%