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Author Saraiji, R,; Oommen, M.S.
Title (up) Dominant contrast as a metric for the lighting of pedestrians Type Journal Article
Year 2014 Publication Lighting Research and Technology Abbreviated Journal
Volume Issue Pages
Keywords Vision; Lighting; Public Safety
Abstract CIE Publication 115 and ANSI/IESNA Recommended Practice 8-00 both use vertical illuminance 1.5 m above the ground as a design criterion for the lighting of pedestrians. While vertical illuminance has the advantage of being easy to calculate and measure, visibility is based primarily on target contrast. A central question related to the visibility of pedestrians is whether drivers need to see the whole pedestrian or can they infer the presence of a pedestrian by recognizing any part of the pedestrian’s shape. The objective of this work was to first explore various pedestrian contrast profiles that could exist and then to find a simplified approach to characterize pedestrian night-time visibility. The problem was addressed through theoretical analyses and computer simulations. Pedestrian contrast was found to be bipolar and dynamic. From the contrast profiles, we developed the concept of dominant contrast, which is defined as the contrast of any part of the pedestrian that provides the highest visibility. Dominant contrast was examined as a metric for street lighting design and night time visibility for (a) an unlit street with car headlights, (b) a lit street without car headlights and (c) a lit street with car headlights. Dominant contrast was found to be a viable metric for street lighting design and night time visibility studies.
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Call Number LoNNe @ kagoburian @ Serial 854
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Author Wieduwilt, A.; Alsat, E.A.; Blickwedel, J.; Strizek, B.; Di Battista, C.; Lachner, A.B.; Plischke, H.; Melaku, T.; Muller, A.; Bagci, S.
Title (up) Dramatically altered environmental lighting conditions in women with high-risk pregnancy during hospitalization Type Journal Article
Year 2020 Publication Chronobiology International Abbreviated Journal Chronobiol Int
Volume in press Issue Pages
Keywords Lighting; Human Health; Pregnant women; circadian rhythm; color temperatures; hospital light environmental; illuminance; indoor
Abstract The maternal circadian time structure is incredibly important in the entrainment and programing of the fetal and newborn circadian time structure. Natural sunlight is the primary environmental time cue for entrainment of circadian rhythms, but high-risk pregnant women spend most of their time indoors with artificial light sources and extremely low levels of natural light both during the day and night. Because the daily level, timing, duration of light exposure and its spectral properties are important in maintaining the normal circadian physiology in humans, we aimed to evaluate the environmental lighting conditions in high-risk pregnant women admitted to hospital for long-term stay. About 30 patients were included in the study. Exposed illuminance, color temperature and effective circadian radiation dose were measured and recorded every 10 s by light dosimeters attached to the patients' clothing. We documented the illuminance of 29 pregnant women on 235 inpatient days. Median (IQR) measured illuminance was 70 (28-173) lux in the morning, 124 (63-241) lux in the afternoon, 19 (6-53) lux in the evening and 0 (0-0) lux at the night. Median illuminance for the 235 inpatient days of assessment was below the recommended EU standard of 100 lux-60.5% of the mornings and 42.7% of the afternoons. The women confined to indoor locations rarely achieved an illuminances more than 300 lux in the morning and in the afternoon. Compared to women with outdoor mobility, those confined indoors have a significantly lower illuminance and color temperature, both in the morning and in the afternoon. Our study presents the first information about the dramatically altered environmental lighting conditions experienced by high-risk pregnant women during their hospital stay. Their exposure to light while in the hospital is significantly lower than exposure to natural daylight levels and below the recommended EU standard.
Address Department of Neonatology and Pediatric Intensive Care Medicine, Children's Hospital, University of Bonn , Bonn, Germany
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ISSN 0742-0528 ISBN Medium
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Notes PMID:32752886 Approved no
Call Number GFZ @ kyba @ Serial 3061
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Author Bieske, K.; Schierz, C.
Title (up) Dynamic Lighting – Perception of Luminous Colour Variation. Type Journal Article
Year 2010 Publication In Proceedings of CIE 2010 „Lighting quality and energy efficiency“. Abbreviated Journal
Volume Issue Pages 290–297
Keywords Lighting
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Call Number LoNNe @ kagoburian @ Serial 997
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Author Dobler, G.; Ghandehari, M.; Koonin, S.E.; Nazari, R.; Patrinos, A.; Sharma, M.S.; Tafvizi, A.; Vo, H.T.; Wurtele, J.S.
Title (up) Dynamics of the urban lightscape Type Journal Article
Year 2015 Publication Information Systems Abbreviated Journal Information Systems
Volume 54 Issue Pages 115–126
Keywords lighting, society, skyglow
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ISSN 0306-4379 ISBN Medium
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Notes Approved no
Call Number LoNNe @ christopher.kyba @ Serial 1212
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Author Campisi, D.; Gitto, S.; Morea, D.
Title (up) Economic feasibility of energy efficiency improvements in street lighting systems in Rome Type Journal Article
Year 2017 Publication International Journal of Energy Economics and Policy Abbreviated Journal
Volume 7 Issue 1 Pages 190-198
Keywords Economics; Energy; Society; LED lighting; LED; real options
Abstract This study evaluates an investment project concerning the redevelopment of the public lighting of the Municipality of Rome. In particular, we consider the replacing of the traditional lamps of the system with LED lamps. We consider the factors that affect this kind of project: the cost of energy, the manteinance cost, the investment cost and the Weighted Average Cost of Capital (WACC). Our results underline the reduction of energy consumption and of the maintenance costs, lower emissions of CO2 into the atmosphere, the reduction of light pollution, the positive effects on road safety and the indipendence by incentives.
Address Department of Industrial Engineering, University of Rome Tor Vergata, Italy
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Publisher Elsevier Place of Publication Editor
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Call Number IDA @ intern @ Serial 2629
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