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Journal of Light & Visual Environment最新文献

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Proposal for the Standard Evaluation Procedure for Non-Visual Action of Light 光的非视觉作用标准评价程序的建议
Journal of Light & Visual Environment Pub Date : 2011-12-01 DOI: 10.2150/JLVE.35.274
R. Kozakov, H. Schoepp
{"title":"Proposal for the Standard Evaluation Procedure for Non-Visual Action of Light","authors":"R. Kozakov, H. Schoepp","doi":"10.2150/JLVE.35.274","DOIUrl":"https://doi.org/10.2150/JLVE.35.274","url":null,"abstract":"Novel findings in the chronobiology show that light plays an important role in the synchronization of the inner biological rhythms of a human with outer environment. Such synchronization is mediated by newly found light-sensitive receptors which don't contribute to the visual perception of light. The results of the ongoing research show that the correct prediction of the light induced melatonin suppression based on the measurements of spectral irradiance at cornea is possible. The correct account for major influence factors allows proposing the standard evaluation procedure for non-visual action of light.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124061148","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
Predicting Long Lifetimes Using Accelerated Reliability Techniques 使用加速可靠性技术预测长寿命
Journal of Light & Visual Environment Pub Date : 2011-12-01 DOI: 10.2150/JLVE.35.222
R. Gibson
{"title":"Predicting Long Lifetimes Using Accelerated Reliability Techniques","authors":"R. Gibson","doi":"10.2150/JLVE.35.222","DOIUrl":"https://doi.org/10.2150/JLVE.35.222","url":null,"abstract":"A continual challenge in lamp development is the need to rapidly test products that have lifetime ratings in the tens of thousands of hours. Traditional life testing, under controlled conditions, remains a mainstay test procedure. However, highly reliable statistical analysis methods allow lamp developers to estimate long lifetimes at a fraction of the testing time. These techniques usually involve the well known Weibull distribution together with historic data, multi-level accelerated stress testing, and virtual failure analysis to reduce the necessary testing times for establishing product life and reliability.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115488222","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
Modern Automotive Headlamps with Improved Light Sources 改进光源的现代汽车前照灯
Journal of Light & Visual Environment Pub Date : 2011-12-01 DOI: 10.2150/JLVE.35.187
M. Sasaki
{"title":"Modern Automotive Headlamps with Improved Light Sources","authors":"M. Sasaki","doi":"10.2150/JLVE.35.187","DOIUrl":"https://doi.org/10.2150/JLVE.35.187","url":null,"abstract":"","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126478115","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: 2
Study of New Materials to Replace the Thoriated-tungsten Electrode 替代钍钨电极新材料的研究
Journal of Light & Visual Environment Pub Date : 2011-12-01 DOI: 10.2150/JLVE.35.245
Tadao Uetsuki, A. Matsuo, Katsuyuki Morii, H. Hatanaka
{"title":"Study of New Materials to Replace the Thoriated-tungsten Electrode","authors":"Tadao Uetsuki, A. Matsuo, Katsuyuki Morii, H. Hatanaka","doi":"10.2150/JLVE.35.245","DOIUrl":"https://doi.org/10.2150/JLVE.35.245","url":null,"abstract":"Thoriated-tungsten (ThO2-W) is popularly used for the electrodes of a super-high pressure mercury lamp, or for arcwelding, because of its excellent performance as to the electron emission. Because it is radioactive, however, a new material which can replace it would be desirable. To find a material to replace ThO2W as the electrode, we have made many kinds of electrodes by a new process, which is different from the traditional process, and evaluated their performance. We have found that neodymium oxide or samarium oxide made by the new process produces encouraging results.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124952155","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
Diagnostics of Planar XeI * UV Exciplex Lamp Excited by Coplanar Surface Barrier Discharge 共面表面阻挡放电激发平面XeI * UV激光灯的诊断
Journal of Light & Visual Environment Pub Date : 2011-12-01 DOI: 10.2150/JLVE.35.241
M. M. Guivan, A. Brablec, Pavel Sťahel, Pavel Lavícek, D. Park, J. Janca
{"title":"Diagnostics of Planar XeI * UV Exciplex Lamp Excited by Coplanar Surface Barrier Discharge","authors":"M. M. Guivan, A. Brablec, Pavel Sťahel, Pavel Lavícek, D. Park, J. Janca","doi":"10.2150/JLVE.35.241","DOIUrl":"https://doi.org/10.2150/JLVE.35.241","url":null,"abstract":"Diagnostics of planar XeI UV exciplex lamp excited by coplanar\u0000surface barrier discharge at pressure 10-100 KPa.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124734783","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
Towards a System Level Reliability Approach for Solid State Lighting 固态照明系统级可靠性研究
Journal of Light & Visual Environment Pub Date : 2011-12-01 DOI: 10.2150/JLVE.35.267
W. Driel, W. Driel, F. Evertz, Guoqi Zhang, Guoqi Zhang
{"title":"Towards a System Level Reliability Approach for Solid State Lighting","authors":"W. Driel, W. Driel, F. Evertz, Guoqi Zhang, Guoqi Zhang","doi":"10.2150/JLVE.35.267","DOIUrl":"https://doi.org/10.2150/JLVE.35.267","url":null,"abstract":"Solid State Lighting applications are slowly but gradually pervading into our daily life. A Solid State Lighting system is composed of a LED engine with a micro-electronic driver(s) in a housing that also supplies the optic design. Knowledge of system level reliability is crucial for the business success of future Solid State Lighting (SSL) systems, and also a very scientific challenge. In practice, a malfunction of the system might be induced by the failure and/or degradation of the subsystems/interfaces. Extra costs, in terms of exceed efforts/designs/parts, has been applied to the system in order to secure the guaranteed reliability performance of SSL system. The most SSL system designs allow few failures of the subsystem/interface during the application period. Hence, a significant cost reduction can be achieved when the system level reliability is well understood by proper experimental and simulation techniques. This paper will cover the reliability of total Solid State Lighting systems including the reliability theories and practices for all(sub-) components, such as LED engines, drivers and fixtures.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124892864","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: 9
Preparation of Eu2+-doped Ca2Si5N8 by carbothermal reduction/nitridation of spray-pyrolyzed oxide/nitride powder and its luminescence properties 喷雾热解氧化物/氮化物粉末碳热还原/氮化法制备Eu2+掺杂Ca2Si5N8及其发光性能
Journal of Light & Visual Environment Pub Date : 2011-12-01 DOI: 10.2150/JLVE.35.207
K. Yamaguchi, H. Hintzen, A. Delsing, H. Kuwahara, S. Koda, K. Itatani
{"title":"Preparation of Eu2+-doped Ca2Si5N8 by carbothermal reduction/nitridation of spray-pyrolyzed oxide/nitride powder and its luminescence properties","authors":"K. Yamaguchi, H. Hintzen, A. Delsing, H. Kuwahara, S. Koda, K. Itatani","doi":"10.2150/JLVE.35.207","DOIUrl":"https://doi.org/10.2150/JLVE.35.207","url":null,"abstract":"The conditions for the preparation of regular-shaped Eu2+-doped calcium silicon nitride ((Ca0.99Eu0.01)2Si5N8) powder were examined by the carbothermal reduction and nitridation (CRN) of oxide/nitride powder prepared by ultrasonic spray pyrolysis. Two kinds of silicon sources, i.e., (i) colloidal silica (CS) and (ii) silicon nitride (Si3N4; SN), were used for the spray pyrolysis. Firstly, the solution containing 0.057 mol·m-3 Ca(NO3)2, 0.140 mol·dm-3CS and 5.71 x 10-4 mol·dm-3Eu(NO3)3 was spray-pyrolyzed at 600°C, and the resulting powder was calcined at 800°C for 10 min in air. The single phase but agglomerated particles of (Ca0.99Eu0.01)2Si5N8 were obtained when the CRN (the relative carbon amount to the stoichiometric amount (m): 1.5) of spray-pyrolyzed/calcined oxide powder was conducted at 1300°C for 2 h in nitrogen (N2) atmosphere. Secondly, the solution containing 0.0285 mol·dm-3Ca(NO3)2, 0.070 mol·dm-3SN and 2.855 x 10-4mol·dm-3Eu(NO3)3 (one-half of the solution concentration compared to the case of CS utilization) was spray-pyrolyzed, and the CRN of spray-pyrolyzed oxide/nitride powder was conducted at 1500°C for 2 h to obtain (Ca0.99Eu0.01)2Si5N8 in N2 atmosphere. The microscopic observation showed that this powder was composed of regular-shaped particles with sizes of approximately 2-3 µm. The excitation and emission peaks of this powder appeared at around 370 and 590 nm, respectively, showing the emission of orange light.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124606097","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
LEDVILLE Project: Traffic Roundabout LED Lighting System. Technical and Social Approaches LEDVILLE项目:交通环岛LED照明系统。技术和社会途径
Journal of Light & Visual Environment Pub Date : 2011-12-01 DOI: 10.2150/JLVE.35.278
M. Aubes, J. Bance, S. Bhosle, Laurent Massol, Patricia Sajous, G. Zissis
{"title":"LEDVILLE Project: Traffic Roundabout LED Lighting System. Technical and Social Approaches","authors":"M. Aubes, J. Bance, S. Bhosle, Laurent Massol, Patricia Sajous, G. Zissis","doi":"10.2150/JLVE.35.278","DOIUrl":"https://doi.org/10.2150/JLVE.35.278","url":null,"abstract":"We report a global study of a LED lighting system for an urban roundabout (LED-VILLE). A study of the photometric performances of the LED used has been performed in our laboratory. Furthermore, average illuminance, uniformity and luminance have been measured and compared to recommended data. Environmental footprints of this lighting system (carbon operation, life cycle analysis and light pollution) has been evaluated and compared to equivalent solution widely used to date. Finally, a social approach of the LED street lighting has been achieved: the visual perception felt by driving or walking users through the roundabout have been collected and analyzed.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116709488","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: 2
Phosphor Converted White LED with Improved Efficiency 荧光粉转换白光LED与提高效率
Journal of Light & Visual Environment Pub Date : 2011-12-01 DOI: 10.2150/JLVE.35.197
Boris Kolodin, G. Kuenzler, J. Lee, Peter W. Brown, Anirudh Deshpande, James Reginelli
{"title":"Phosphor Converted White LED with Improved Efficiency","authors":"Boris Kolodin, G. Kuenzler, J. Lee, Peter W. Brown, Anirudh Deshpande, James Reginelli","doi":"10.2150/JLVE.35.197","DOIUrl":"https://doi.org/10.2150/JLVE.35.197","url":null,"abstract":"Proposed short pass filter (SPF) employment to improve efficiency of phosphor converted white LED based on near UV LED dies and remote RGB phosphor architecture. SPF is transparent for near UV radiation in the 390-430 nm spectral range and possesses high reflectance for visual spectral range. SPF is placed between near UV LED and phosphor layer and redirects part of down warding white light to the outside of the package. Demonstrated 26 % average improvements for the conversion efficiency from 10.9 to 8.0 mW/Lm and 24 % average increase for luminous efficacy for 3000°K CCT and 85 CRI.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115742938","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
Reliable Measurements of UV Lamp Performance Using a Near-Field Technique 使用近场技术可靠测量紫外灯性能
Journal of Light & Visual Environment Pub Date : 2011-12-01 DOI: 10.2150/JLVE.35.234
D. Knight, R. Kilgour
{"title":"Reliable Measurements of UV Lamp Performance Using a Near-Field Technique","authors":"D. Knight, R. Kilgour","doi":"10.2150/JLVE.35.234","DOIUrl":"https://doi.org/10.2150/JLVE.35.234","url":null,"abstract":"Low pressure mercury arc lamps are an effective ultraviolet light source for disinfection of water. Critical lamp operating parameters such as the decrease in UV output with time, effect of water temperature on lamp output, and the effect of lamp dimming should be determined using a lamp in water. The reliable operation of a near-field test apparatus is described that is capable of measuring these quantities. The use of a radiometer with fiber optic light collection and standard reference lamp results in the reproducible measurement of these values using the near-field system. The stability of measurement is obtained using the reference lamp, which compensates for variations in the response of the fiber optic assembly. For sample lamps, a decrease of 11% output over 12,000 hours was observed. For the same lamp type, the relative calibrated output of the lamp increases between 5 and 50°C, with a ±10% change in lamp output relative to the reference temperature of 20°C. The apparatus samples the irradiance at a local point on the lamp, but the UV output of low pressure amalgam lamps as determined by the near-field technique is shown to be uniform over the entire lamp, except for within 1 cm of the lamp filament. This is shown for both new and 12,000 hour aged lamps, so that accurate lamp aging data can be determined. The change in UV output with water temperature change was demonstrated to be similar for both new and aged lamps in this study, except for the expected decrease in peak lamp UV output noted for the aged lamp.","PeriodicalId":311488,"journal":{"name":"Journal of Light & Visual Environment","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130584220","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
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