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- Billger, Monica, 1961, et al.
(författare)
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An assessment method for evaluating colour rendering properties of light sources
- 2015
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Ingår i: Proceedings of the 28th Session of the CIE, Manchester, United Kingdom, 28 June – 4 July 2015. - 9783902842558 ; Volume 1:part 2, s. 954-963
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Konferensbidrag (refereegranskat)abstract
- Abstract We present an assessment method to evaluate how the spectral power distribution of light influences the perception of colours and small colour differences. Included in the method are several ways to measure properties of reflected light with a spectroradiometer, visual assessments of perceived colours, and a visual performance test that aims at identifying an individual minimum colour contrast visibility threshold. In a first application of the assessment method, we used a colour contrast test chart printed on paper and studied it under the illumination of three LED light sources, halogen light and daylight. We concluded that the visual performance test was effective for reviling visibility thresholds for colour contrasts and that the method has potential for understanding the influence of spectral power distribution on perceived colour and visual performance. The methodology can be useful for optimizing illumination for individual needs.
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| 2. |
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| 3. |
- Johansson, Maria, et al.
(författare)
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Perceived lighting qualities and pedestrians’ performance
- 2015
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Ingår i: CIE 216:2015 : Proceedings of the 28th Session of the CIE, Manchester, United Kingdom, 28 June-4 July 2015 - Proceedings of the 28th Session of the CIE, Manchester, United Kingdom, 28 June-4 July 2015. - 9783902842558
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Konferensbidrag (refereegranskat)abstract
- Street lighting is an essential feature of pedestrian paths that may increase the amount of walking. This study aimed to identify associations between perceived lighting qualities, and experience of the lit environment and performance of critical tasks. In a full-scale laboratory 89 participants walked along a pedestrian path with three different outdoor lighting applications (CDM and LEDs). After each walk they rated the perceived lighting qualities, perceived visibility and affective experience of walking in the lit environment. Walking speed was measured and obstacle detection, sign-reading and facial recognition were tested. Multiple regression analyses suggest that photometric measures are required to guarantee that pedestrians’ can orientate and safely move after dark. Perceived lighting qualities may however account for individual differences in the assessment of one and the same lighting application with regard to perceived visibility and the affective experience of walking in the lit environment and may thereby affect walking.
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