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Pilot Study on Estimation of Upward Flux by Luminance Distribution of Night Sky Luminance 利用夜空亮度分布估算上行通量的初步研究
Journal of Light & Visual Environment Pub Date : 2017-03-10 DOI: 10.2150/JLVE.IEIJ150000562
T. Iwata, Yu Tsuyuki, D. Ito, K. Tsuda
{"title":"Pilot Study on Estimation of Upward Flux by Luminance Distribution of Night Sky Luminance","authors":"T. Iwata, Yu Tsuyuki, D. Ito, K. Tsuda","doi":"10.2150/JLVE.IEIJ150000562","DOIUrl":"https://doi.org/10.2150/JLVE.IEIJ150000562","url":null,"abstract":"The upward flux from the cities may cause sky glow. The purpose of our study is to calculate the upward flux from luminance distribution of night sky viewed from ground level on cloudy days. In this study the clouds’ heights and the reflectance of the clouds are used as well as luminance distribution of the night sky to calculate the upward flux. The reflectance of the cloud is presumed from the cloud type which is determined from the cloud model of Liou’s study referring to cloud heights and radiant temperature. An experiment is carried out using a scale model to verify the precision of the method. It is confirmed that upward flux can be almost precisely calculated by this method. The Tokyo metropolitan area is divided using grids (2.5 km×2.5 km) and the upward luminous flux of each area is calculated. A set of six measurement points is chosen which can measure the upward luminous flux from all light-emitting areas, and each measurement point must not have any obstacles in the viewing angle of the cloud infrared radiometer. The results show that 5 lm/m2 of upward luminous flux was emitted from the center of Tokyo. The distribution of the electricity wastage emitted to the sky was also illustrated.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131716242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on evaluation of LED lighting glare in pedestrian zones 行人专用区LED照明眩光评价研究
Journal of Light & Visual Environment Pub Date : 2015-12-26 DOI: 10.2150/JLVE.IEIJ150000566
S. Kohko, M. Ayama, M. Iwata, Nobuhiro Kyoto, Toshihiro Toyota
{"title":"Study on evaluation of LED lighting glare in pedestrian zones","authors":"S. Kohko, M. Ayama, M. Iwata, Nobuhiro Kyoto, Toshihiro Toyota","doi":"10.2150/JLVE.IEIJ150000566","DOIUrl":"https://doi.org/10.2150/JLVE.IEIJ150000566","url":null,"abstract":"At present, there is no internationally accepted method of evaluation that converts discomfort glare in pedestrian zones into numerical form. While LED streetlights are rapidly coming into wide use, their lightemitting parts are often nonuniform in luminance compared with streetlights that employ HID lamps. This nonuniformity has been noted as a factor responsible for the emergence of glare. A subjective evaluation experiment was conducted with seven types of streetlights placed in an outdoor field that simulated a pedestrian zone. The streetlights used for the experiment were selected in consideration of the type of light source and the luminance uniformity of the light-emitting surfaces. The results showed that luminancebased photometric quantities are a better measure of discomfort glare than is the illuminance at the observer’s eye for light sources with both uniform and nonuniform surfaces. Based on the experimental results, a new evaluation equation that converts discomfort glare in pedestrian zones is proposed.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129010525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Experimental Research on Application of the Natural Light to Tunnel Lighting Engineering 自然光在隧道照明工程中的应用实验研究
Journal of Light & Visual Environment Pub Date : 2015-05-11 DOI: 10.2150/JLVE.IEIJ140000541
Bao-Lin Wang, Ying Ye, Bingya Yan
{"title":"Experimental Research on Application of the Natural Light to Tunnel Lighting Engineering","authors":"Bao-Lin Wang, Ying Ye, Bingya Yan","doi":"10.2150/JLVE.IEIJ140000541","DOIUrl":"https://doi.org/10.2150/JLVE.IEIJ140000541","url":null,"abstract":"In present paper, the natural light was led into the entrance section of a highway tunnel by the specially designed lighting bands, and the lighting luminance profile was modeled referring to the human visual adaptation curve. As the result, the lighting enhanced at the entrance section was completely canceled. In order to validate the current scheme, lighting effects were evaluated by experimental data. In contrast to the conventional schemes, this scheme presented more advantages: (1) Eliminating the (cid:98) black-hole effect (cid:96) of tunnel entrance, which significantly improved the driving safety and amenity. (2) The energy-saving of lighting was very considerable. (3) The scheme was simple, practical, and reasonable in cost. It could be concluded the application of natural light to tunnel lighting engineering had significant popu larization value.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114576321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
LED Signal Board for Providing Tidal Current Information at Kurushima Kaikyo Traffic Route 在黑岛海京交通路线上提供潮流信息的LED信号板
Journal of Light & Visual Environment Pub Date : 2014-03-31 DOI: 10.2150/JLVE.IEIJ130000521
Kazuyuki Tanaka, Hiroaki Tanaka, Fumihiro Shinomiya, Yuta Takagi, M. Hara, K. Hanano, Shinobu Sodekawa, K. Igarashi
{"title":"LED Signal Board for Providing Tidal Current Information at Kurushima Kaikyo Traffic Route","authors":"Kazuyuki Tanaka, Hiroaki Tanaka, Fumihiro Shinomiya, Yuta Takagi, M. Hara, K. Hanano, Shinobu Sodekawa, K. Igarashi","doi":"10.2150/JLVE.IEIJ130000521","DOIUrl":"https://doi.org/10.2150/JLVE.IEIJ130000521","url":null,"abstract":"The Japan Coast Guard (JCG) provides the tidal current information at Kurushima Kaikyo Strait for vessels which are passing the Strait according to the Maritime Traffic Safety Law. In March 2012, we unified the information provision methods to the Electric Sign. We have 6 Electric Signal Boards at 4 Signal Stations and we installed 4 LED Signal Boards at 2 Signal Stations. The result of visibility survey of the signal boards using LED Units shows good condition to provide the tidal current information for vessels at Kurushima Kaikyo Strait area. usually use","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114815015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Reform Plan for the Journal of Light & Visual Environment 《光与视觉环境》杂志改革方案
Journal of Light & Visual Environment Pub Date : 2014-03-31 DOI: 10.2150/JLVE.IEIJ14A000004
M. Jinno
{"title":"Reform Plan for the Journal of Light & Visual Environment","authors":"M. Jinno","doi":"10.2150/JLVE.IEIJ14A000004","DOIUrl":"https://doi.org/10.2150/JLVE.IEIJ14A000004","url":null,"abstract":"","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127844331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Attention-attracting Facilities Utilizing Vection 利用向量吸引注意力的设施
Journal of Light & Visual Environment Pub Date : 2014-03-31 DOI: 10.2150/JLVE.IEIJ130000528
Kouji Yamamoto, Hideki Takahashi
{"title":"Attention-attracting Facilities Utilizing Vection","authors":"Kouji Yamamoto, Hideki Takahashi","doi":"10.2150/JLVE.IEIJ130000528","DOIUrl":"https://doi.org/10.2150/JLVE.IEIJ130000528","url":null,"abstract":"In an attempt to prevent excessive increases or decreases in speed when driving motor vehicles, Central Nippon Expressway Company Limited (hereinafter referred to as “C-NEXCO”) is currently conducting research on controlling a driver’s sense of speed, etc., by installing light-emitting devices on highway shoulders at regular intervals and by regulating their emission of light according to an arbitrary light-emitting pattern. Research results on the control of speed utilizing light-emitting devices have been accumulated. Regarding conventional research to urge drivers to regulate their traveling speed by drawing their attention or guiding their lines of sight to blinking or the turning on of light-emitting devices sequentially placed along potentially dangerous road areas, one issue of difficulty concerned responding to excessive traveling speed caused by becoming “acclimatized” to the speed and any excessive decrease in speed during sagging road section. In this paper, as an effort to control the sense of speed utilizing the perception of self-motion induced by visual sensation (hereinafter referred to as “vection”) and as a focus on taxis that move in response to the stimulus of light (hereinafter referred to as “phototaxis”), we would like to report on a basic examination conducted through a questionnaire experiment using CG simulation images and the actual effects thereof, as verified in experiments on actual roads conducted using an expressway under construction (based on the examination results).","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114804805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Visibility Enhancement and Power Saving by Pro-beam LED Tunnel Lighting Method 前光束LED隧道照明方法提高能见度和节能
Journal of Light & Visual Environment Pub Date : 2014-03-31 DOI: 10.2150/JLVE.IEIJ130000523
M. Sato, Tomokazu Hagio
{"title":"Visibility Enhancement and Power Saving by Pro-beam LED Tunnel Lighting Method","authors":"M. Sato, Tomokazu Hagio","doi":"10.2150/JLVE.IEIJ130000523","DOIUrl":"https://doi.org/10.2150/JLVE.IEIJ130000523","url":null,"abstract":"The symmetrical lighting system, which is appropriate to recognize an object with silhouette vision, has been used for many years as tunnel interior lighting. The pro-beam lighting system however has an advantage to enhance visibility with reversed silhouette and has being investigated for more safe and comfortable driving in the tunnel for several years by the NEXCO group, especially to increase visibility for a preceding vehicle to prevent rear-end collisions. The pro-beam lighting with ceramic metal halide lamps was largely adapted for 70 tunnels of New Tokyo–Nagoya expressway in 2012, and further study has being made to achieve both good visibility and power efficiency with the use of LED pro-beam lighting. In this paper, the research concerning to pro-beam lighting are described such as visibility analysis of LED tunnel lighting, enhanced visibility by pro-beam, and evaluation of experimental installation by both field observations and the mathematical values of total revealing power. The evaluation of the LED pro-beam tunnel showed good visibility and power efficiency.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128405994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
An Approach to Reduce AC LED Flicker 一种减少交流LED闪烁的方法
Journal of Light & Visual Environment Pub Date : 2014-03-31 DOI: 10.2150/JLVE.IEIJ130000531
J. Tan, N. Narendran
{"title":"An Approach to Reduce AC LED Flicker","authors":"J. Tan, N. Narendran","doi":"10.2150/JLVE.IEIJ130000531","DOIUrl":"https://doi.org/10.2150/JLVE.IEIJ130000531","url":null,"abstract":"In this paper, we investigate a circuit design to reduce light flicker from an alternating current (AC) lightemitting diode (LED) lighting system. AC LEDs in the commercial marketplace have been criticized for the light flicker that they produce. In general, light flicker is an unwelcome phenomenon in a lighting application because of the health hazards it may cause. Some solutions have been proposed to reduce flicker from light sources, but they suffer from issues such as low power factor, low power efficiency, or bulky size. Here we propose an approach that can effectively reduce light flicker from an AC LED lighting system while maintaining normal power factor and high power efficiency.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133916872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
A Design Approach for Visual Environment of Passenger Rooms for Public Transport to Increase Comfort 提高舒适性的公共交通乘客室视觉环境设计方法
Journal of Light & Visual Environment Pub Date : 2014-03-31 DOI: 10.2150/JLVE.IEIJ130000527
T. Hirasawa, Y. Suda
{"title":"A Design Approach for Visual Environment of Passenger Rooms for Public Transport to Increase Comfort","authors":"T. Hirasawa, Y. Suda","doi":"10.2150/JLVE.IEIJ130000527","DOIUrl":"https://doi.org/10.2150/JLVE.IEIJ130000527","url":null,"abstract":"A design methodology for both comfortable and accessible passenger rooms for public transport has been developed based on observation and modeling of seat-taking behaviors. The developed model consists of variables of visual environment of passenger rooms, whose parameters are identified through full-scale mockup experiments. The model enables quantitative comparisons between design alternatives of seat arrangements and door usages, thus this has been applied to propose seat arrangements for railway vehicles, light rail vehicles and a new unmanned energy-saving small urban transport system called “Eco-Ride” with small additional procedures for model extension.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133972651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
RF/Microwave Discharge Plasma for Mercury-Free Lighting 射频/微波放电等离子体无汞照明
Journal of Light & Visual Environment Pub Date : 2014-03-31 DOI: 10.2150/JLVE.IEIJ130000533
A. N. Dagang, H. Motomura, M. Jinno
{"title":"RF/Microwave Discharge Plasma for Mercury-Free Lighting","authors":"A. N. Dagang, H. Motomura, M. Jinno","doi":"10.2150/JLVE.IEIJ130000533","DOIUrl":"https://doi.org/10.2150/JLVE.IEIJ130000533","url":null,"abstract":"This research focused on the development of a mercury-free light source through the use of radio frequency (RF) and microwave discharges. RF at 13.56 MHz and microwave at 2.45 GHz were applied to generate the plasma. With the use of this kind of high frequency power generator, plasma can be ignited without using the electrodes inside the chamber or discharge tube, which could significantly increase the lamp lifetime. The potential for high luminance, excellent colour rendering and environmental-friendliness makes xenon the most promising candidate as the replacement for the mercury fluorescent lamp. In this research, RF energy at 13.56 MHz was induced to the cylindrical discharge tube in order to investigate the characteristics of the xenon RF-inductively coupled plasma discharge as a light source. The luminance, spectral distribution and colour rendering index were measured. The values of the luminance and colour rendering index were comparative to the values for a conventional discharge lamp. For microwave plasma, in order to develop a planar-type lamp, surface wave plasma was applied. A few types (transverse, inclined, longitudinal) of slot antennas were tested and the lamp brightness and discharge uniformity were evaluated. The chamber window (front or rear) was coated with a three-colour phosphor from the combination of red, green and blue phosphors and the excitation effect was investigated. From phosphor coating and slot structure optimisations, lamp luminance and discharge uniformity could be improved.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125391689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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