Outdoor lighting - Mesopic photometry, adaptation conditions and user preferences in pedestrian way lighting

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Puolakka, Marjukka, Dr., Aalto University, Department of Electrical Engineering and Automation, Finland
dc.contributor.author Luo, Wei
dc.date.accessioned 2014-06-16T09:00:14Z
dc.date.available 2014-06-16T09:00:14Z
dc.date.issued 2014
dc.identifier.isbn 978-952-60-5723-1 (electronic)
dc.identifier.isbn 978-952-60-5722-4 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/13355
dc.description.abstract The starting point of this work is to review the current recommendations and criteria of road and pedestrian way lighting. At present, the emphasis of traffic safety, the increasing energy costs, and improvements in mesopic photometry have led to new discussions about the accuracy of the recommendations for road lighting. Sufficient road lighting is generally based on the lighting requirements given in different lighting classes. For road lighting, the value of 2 cd/m2 is recommended as the minimum average road surface luminance for the highest lighting class in the CIE and CEN publications. The basis of the average road surface luminance for the lower lighting classes is unknown and lacks experimental works. Moreover, the experimental set-ups of the studies conducted in the 1930s and 1950s do not meet the conditions of motor traffic lighting nowadays. They also have deficiencies in the number and age distributions of the subjects. The values of the average horizontal illuminances of the pedestrian way lighting recommendations are based on studies conducted in the 1970s and 1980s. However, no information exists on how the recommended illuminance values are derived for the different lighting classes. The current recommendations for outdoor lighting are based on photopic photometry, this is daylight visibility conditions. In outdoor lighting, the luminances are in the mesopic range. The CIE recommended system for mesopic photometry should be used in providing recommendations and criteria for both road and pedestrian way lighting. Before implementing mesopic photometry, the adaptation luminance of the road users should be known. This study examined the adaptation conditions of pedestrians based on eye-tracking measurements. A case study in a pedestrian way was conducted in Chongqing of China. The study is related to the currently ongoing task of the CIE JCT-1 Implementation of CIE 191 System for Mesopic Photometry in Outdoor Lighting, which is to investigate adaptation and viewing conditions and define visual adaptation fields in outdoor lighting. The case study consisted of eye-tracking measurements and subjective evaluations of the lighting conditions. It was found that the eye-fixation areas and locations were around a central area of the road surface in the horizontal level but spread over a wider area in the vertical level. The subjective importance of facial recognition depends on the specific visual tasks at different light levels in a pedestrian way. The results also suggest that further studies using an eye-tracking system could combine eye-fixation data with pupil size and luminance data. This would help in further analysis of visual adaptation fields of the road users. en
dc.format.extent 68 + app. 56
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 85/2014
dc.relation.haspart [Publication 1]: Luo, Wei; Puolakka, Marjukka; Viikari, Meri; Kufeoglu, Sinan; Ylinen, Anne; Halonen, Liisa. 2012. Lighting criteria for road lighting: a review. Light& Engineering, vol.20, No.4, pp.64-74.
dc.relation.haspart [Publication 2]: Luo, Wei; Puolakka, Marjukka; Halonen, Liisa. 2012. Mesopic photometry: The CIE 191 system based on visual performance. China Illuminating Engineering Journal, vol.7, No.1, pp.11-14.
dc.relation.haspart [Publication 3]: Luo, Wei; Puolakka, Marjukka; Halonen, Liisa. 2012. Outdoor lighting- considerations of mesopic photometry and light source SPD, China Illuminating Engineering Journal, vol.7, No.1, pp.29-32.
dc.relation.haspart [Publication 4]: Puolakka, Marjukka; Cengiz, Can; Luo, Wei; Halonen, Liisa. 2012. Implementation of CIE 191 mesopic photometry-ongoing and future actions, In: Proceedings of CIE 2012 Lighting Quality & Energy Efficiency, Hangzhou, China, pp.64-70.
dc.relation.haspart [Publication 5]: Luo, Wei; Puolakka, Marjukka; Zhang, Qingwen; Yang, Chunyu; Halonen, Liisa. 2013. Pedestrian way lighting: user preferences and eye-fixation measurements, Journal of Lighting Engineering, vol.15, No.1, pp.19-34.
dc.subject.other Electrical engineering en
dc.title Outdoor lighting - Mesopic photometry, adaptation conditions and user preferences in pedestrian way lighting en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.contributor.school School of Electrical Engineering en
dc.contributor.department Sähkötekniikan ja automaation laitos fi
dc.contributor.department Department of Electrical Engineering and Automation en
dc.subject.keyword lighting criteria en
dc.subject.keyword road lighting en
dc.subject.keyword pedestrian way lighting en
dc.subject.keyword system of mesopic system en
dc.subject.keyword visual adaptation field en
dc.subject.keyword eye-tracking system en
dc.identifier.urn URN:ISBN:978-952-60-5723-1
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Halonen, Liisa, Prof., Aalto University, Department of Electrical Engineering and Automation, Finland
dc.opn Fontoynont, Marc, Prof., Aalborg University, Danmark
dc.opn Vainio, Teija, Dr., University of Tampere, Finland
dc.contributor.lab Lighting Unit en
dc.rev Fontoynont, Marc, Prof., Aalborg University, Danmark
dc.rev Lin, Yandan, Prof., Fudan University, China
dc.date.defence 2014-06-27

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