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Author Jin-Joo Lee, Seong-Sik Yoo, Ho-Seok Kang, Dong-Hee Kim, Jin-Ho Nam, Hyun-Ji Kim, Hoon Kim url  openurl
  Title A Research on Visual Performance at Different Ages Depending on Color Temperature of Headlights Type Journal Article
  Year 2017 Publication Journal of the Korean Institute of Illuminating and Electrical Installation Engineers Abbreviated Journal (up)  
  Volume 31 Issue 8 Pages 40-48  
  Keywords Lighting  
  Abstract Under night-time driving conditions, both cones and rods in eye’s retina simultaneously act to influence mesopic vision in two areas: central and peripheral visions. However, as people age, the amount of light received as well as the color temperature perceived by the human eyes also change. This research, through simulations and scaled down experiments with various headlight color temperatures and two levels of fixed brightness, deals with differences in ability to detect and identify obstacles by the subjects in their 20’s and 50’s.

According to the results obtained from the experiments on peripheral vision, subjects in their 20’s detected the obstacles more quickly at the combined color temperature of 3,000K+4,500K than at the single color temperature of 4,500K, and likewise at 3,000K+5,500K than at 5,500K; this tendency was significantly more noticeable for the subjects in their 50’s. As for the central vision, the results showed that there were no significant differences due to color temperature between the subjects in their 20’s and those in their 50’s. Moreover, the landolt ring experiment conducted under low luminance yielded higher percentage of correct answers at combined color temperatures.
 
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  Call Number LoNNe @ kyba @ Serial 1743  
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Author John D. Bullough url  openurl
  Title Opinion: Will road lighting wither? Type Journal Article
  Year 2017 Publication Lighting Research & Technology Abbreviated Journal (up)  
  Volume 49 Issue Pages 672  
  Keywords Commentary; Lighting  
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  Notes Approved no  
  Call Number LoNNe @ kyba @ Serial 1761  
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Author John Bullough url  doi
openurl 
  Title Factors Affecting Sign Visibility, Conspicuity, and Legibility: Review and Annotated Bibliography Type Journal Article
  Year 2017 Publication Interdisciplinary Journal of Signage and Wayfinding Abbreviated Journal (up)  
  Volume 1 Issue 2 Pages 2-25  
  Keywords Lighting  
  Abstract This paper summarizes published research studies, technical reports and codes and standards related to the visibility (i.e., conspicuity and legibility) of signage. In the summary that follows, publications are grouped and discussed according to several different topics. First, the typographic and symbolic characteristics of signs and the information they carry are described (e.g., letter size, font selection, etc.); second, photometric, colorimetric and temporal properties of signs as they affect visibility; finally, environmental considerations (e.g., daytime versus nighttime viewing, whether a sign is located in a rural or urban area, etc.) as they influence sign design are reviewed. Annotated summaries of each publication in the literature review are included at the end of this paper.  
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  Call Number LoNNe @ kyba @ Serial 1762  
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Author Riad Saraiji, M. Saju Oommen url  openurl
  Title Light Pollution Index (LPI): An Integrated Approach to Study Light Pollution with Street Lighting and Façade Lighting Type Journal Article
  Year 2012 Publication The Journal of the Illuminating Engineering Society Abbreviated Journal (up)  
  Volume 9 Issue 2 Pages 127-145  
  Keywords Planning; Lighting  
  Abstract Rather than being complementary, street lighting and façade lighting are typically designed independently of each other. As a result, light from street lighting luminaires might spill onto building façades and influence characteristics of the façade lighting including required light levels and color. Conversely, façade lighting might reflect onto the street and contribute to the street illumination. This manuscript presents an integrated approach to analyzing the interaction between the street and façade lighting in consideration of light pollution control. A generic street model with various calculation grids was studied. It was found that a moderately lit façade contributes to a horizontal illuminance of 5 lux or more on the street and a vertical illuminance of 4 lux or more 1.5 m above the sidewalk. An over-illuminated street may result when both street and façade lighting exist without reference to each other. The size of the light-pollution calculation grid and the use of a 3-D illuminance graph were studied. It was found that fluctuations in the calculated amount of light pollution could occur unless the size of the pollution calculation grid is large enough to capture all of the upward flux. A method of achieving the optimal size of the calculation grid is demonstrated. Shortcomings of using light pollution percentage as a light pollution index are highlighted and an alternative light pollution index is proposed.  
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  Call Number LoNNe @ kyba @ Serial 1764  
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Author S Fotios, J Uttley url  doi
openurl 
  Title Illuminance required to detect a pavement obstacle of critical size Type Journal Article
  Year 2018 Publication Lighting Research & Technology Abbreviated Journal (up)  
  Volume 50 Issue Pages 390-404  
  Keywords Vision; Lighting  
  Abstract This paper investigates the illuminance needed to detect trip hazards for pedestrians walking after dark. In previous work, it was assumed that the critical obstacle height is 25 mm: further review of accident data and foot clearance data suggests instead that 10 mm is the critical height. Eye tracking records suggest a tendency for obstacles to be detected approximately 3.4 m ahead. Interpretation of obstacle detection data suggests horizontal photopic illuminances of up to 0.9 lux are required for peripheral detection of a 10 mm obstacle 3.4 m ahead, according to the scotopic/photopic ratio of the lighting and the age of the observer.  
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  Notes Approved no  
  Call Number LoNNe @ kyba @ Serial 1765  
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