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Jin-Joo Lee, Seong-Sik Yoo, Ho-Seok Kang, Dong-Hee Kim, Jin-Ho Nam, Hyun-Ji Kim, Hoon Kim |
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A Research on Visual Performance at Different Ages Depending on Color Temperature of Headlights |
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2017 |
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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers |
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31 |
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8 |
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40-48 |
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Lighting |
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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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LoNNe @ kyba @ |
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1743 |
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Gutierrez-Escolar, A.; Castillo-Martinez, A.; Gomez-Pulido, J.; Gutierrez-Martinez, J.-M.; González-Seco, E.; Stapic, Z. |
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A review of energy efficiency label of street lighting systems |
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Journal Article |
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2016 |
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Energy Efficiency |
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Energy Efficiency |
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1-18 |
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Energy; Energy Efficiency Index; Total Luminous Flux; Energy Efficiency Label; Electronic Ballast; Energy Performance Indicator; Lighting Project; Energy Efficiency Class; Energy Efficiency Level; Road Lighting; Active PowerLighting System; Wind Turbine; Current Energy Efficiency; Luminous Efficacy; Electricity Consumption; Kiviat diagram; Lamp; Light pollution; Pie chart; Dimming luminous flux; review |
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There are very few countries that have provisions addressing the energy efficiency of the whole street lighting system, such as Spain or the Netherlands. Nevertheless, there is not an agreement about how energy efficiency must be assessed. The Spanish Government contemplates it in the Royal Decree 1890/2008 with the goal of improving energy savings and efficiency. However, this has not obtained the expected results. Nowadays, energy efficiency of this kind of systems is assessed using a label. In the case of Spain, this label only assesses one magnitude. The contributions of this paper are two evaluation systems (kiviat diagram and pie chart) which assess five magnitudes: lamps, energy efficiency index, light pollution, renewable energy contribution, and harness of the luminous flux using dimming. After that, a survey was done to study several subjects: (1) if citizens are aware about the efficiency of street lighting systems, (2) whether the sample of colors used in the label is adequate, and (3) if our proposed systems could replace the current evaluation system. Finally, the paper finishes with the conclusions of the survey. |
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Department of Computer Sciences, Polytechnic School, University of Alcala, Road Madrid-Barcelona, Km 33.6, Alcala de Henares, 28871, Spain |
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Springer |
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English |
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1570-6478 |
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IDA @ john @ |
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1471 |
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Juntunen, E.; Tetri, E.; Tapaninen, O.; Yrjänä S.; Kondratyev, V; . Sitomaniemi, A.; Siirtola, H.; Sarjanoja, E.M.; Aikio, J.; Heikkinen, V |
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A smart LED luminaire for energy savings in pedestrian road lighting. |
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2013 |
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Lighting Research and Technology |
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47 |
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1 |
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103-115 |
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Lighting |
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LoNNe @ kagoburian @ |
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639 |
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Liu, X.Y.; Luo, M.R.; Li, H. |
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A study of atmosphere perceptions in a living room |
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2014 |
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Lighting Research and Technology |
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Lighting Research and Technology |
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47 |
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5 |
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581-594 |
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lighting; indoor lighting; perception; Chinese; Dutch; aesthetics |
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An experiment has been carried out to investigate the effect of lighting on the perception of atmosphere in a living room, using three types of light sources: halogen, fluorescent and LED lamps. In a psychophysical experiment, 29 native Chinese observers assessed eight lighting conditions having different luminances and correlated colour temperatures. For each condition, 71 scales were employed using the categorical judgment method. Factor analysis identified two underlying dimensions: liveliness and cosiness. This agrees with those found by Vogels who used Dutch observers to assess atmosphere perception. Both observer groups also agreed that an increase of luminance would make the room more lively. However, there were also some disagreements such as a higher CCT source would make the room more lively for Chinese observers but less lively for Dutch observers. |
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State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, China |
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SAGE |
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IDA @ john @ |
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310 |
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Ho, C.Y.; Lin, H.T.; Huang, K.Y. |
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A Study on Energy Saving and Light Pollution of LED Advertising Signs |
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2011 |
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Applied Mechanics and Materials |
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Amm |
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121-126 |
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2979-2984 |
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Advertising Sign; LED; Light Trespass; Luminance Limit; Saving Energy; Vertical Illuminance; *Lighting |
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Lighting advertising signs not only play an important role in outdoor lighting environment in Taiwan, but also become the main factor of energy consumption in urban areas at night. Light-emitting diode (LED) has been gradually used in advertising signs due to its advantages. However, in order to be conspicuous and legible in the daytime, signs that are excessively bright may result in considerable light pollution and energy waste at nighttime. Therefore, this research aims to measure the luminance of LED signs and traditional internally lighted signs, and analyze the light trespass from each signage. Based on the research results, the energy consumption from a LED full color screen is 12 times more than a traditional internally lighted sign per day. Statistically, all kinds of LED signs are much higher than traditional internally lighted signs in the percentage of excessive brightness and average luminance value. As for the light trespass, since the vertical illuminance on facade facing the signs increases with the increase of the sign area or the decrease of the distance between the sign and the facade, the vertical illuminance on facade facing the signs would exceed the limit of CIE even if the luminance of the signs achieves the standard of CIE in terms of the general conditions in Taiwan. This happens to LED full color screens in particular and thus results in considerable obtrusive light. To sum up, in order to reduce unnecessary energy consumption and improve the nighttime lighting quality for outdoor environment, this research recommends the luminance limitation for light dimming of LED advertising signs should refer to the zoning, time period, and sign area. |
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1662-7482 |
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IDA @ john @ |
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126 |
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