This paper details the results of an experimental study investigating the influence of daylight illuminance levels and indoor temperatures on objective and subjective performance evaluations, investigated through paper-based tasks and questionnaires, respectively. Experiments were conducted in an office-like test room with controllable indoor temperature and easy-to-change glazing visible transmittance. A total of 84 participants took part in the experiment, performed only under clear sky conditions to avoid variations in illuminance. In a randomized order, participants were exposed to three daylight illuminance levels (on average 140, 610 and 1440 lux) at one of three temperature conditions: 19, 23 and 27°C. Results show that objective performance outcomes were not affected by daylight illuminance or temperature, nor by their interactions, but only by the order of the test presentation ( indicating a learning effect). Of the subjective responses, only perceived concentration was affected by daylight conditions, with a self-reported lower concentration under the low illuminance level.
{"title":"COGNITIVE PERFORMANCE EVALUATION UNDER CONTROLLED DAYLIGHT LEVELS AT DIFFERENT INDOOR TEMPERATURES","authors":"G. Chinazzo, J. Wienold, M. Andersen","doi":"10.25039/X46.2019.PO004","DOIUrl":"https://doi.org/10.25039/X46.2019.PO004","url":null,"abstract":"This paper details the results of an experimental study investigating the influence of daylight illuminance levels and indoor temperatures on objective and subjective performance evaluations, investigated through paper-based tasks and questionnaires, respectively. Experiments were conducted in an office-like test room with controllable indoor temperature and easy-to-change glazing visible transmittance. A total of 84 participants took part in the experiment, performed only under clear sky conditions to avoid variations in illuminance. In a randomized order, participants were exposed to three daylight illuminance levels (on average 140, 610 and 1440 lux) at one of three temperature conditions: 19, 23 and 27°C. Results show that objective performance outcomes were not affected by daylight illuminance or temperature, nor by their interactions, but only by the order of the test presentation ( indicating a learning effect). Of the subjective responses, only perceived concentration was affected by daylight conditions, with a self-reported lower concentration under the low illuminance level.","PeriodicalId":121032,"journal":{"name":"PROCEEDINGS OF the 29th Quadrennial Session of the CIE","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116915542","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}
The National Institute of Standards and Technology (NIST) began to offer proficiency testing for Solid-State Lighting (SSL) products through a Measurement Assurance Program (MAP) in 2010. This article communicates the results of the first version of the MAP in which 118 worldwide laboratories participated. Statistical analysis of how the laboratories’ measurements compared to NIST’s measurements are presented. In general, all the laboratory results are within +/- 4 % for total luminous flux and luminous efficacy measurements. The discussion provides reasons for any discrepancies or large uncertainty intervals found in the data. A major finding was that measurement differences of RMS current had a larger standard deviation and number of outliers than expected. Two possible explanations are (1) the discrepancies are due to issues with using 4-pole sockets, and (2) the large deviation is caused by some solid state lamps being sensitive to impedance and slew rate of AC power supplies.
{"title":"SOLID-STATE LIGHTING MEASUREMENT ASSURANCE PROGRAM SUMMARY WITH ANALYSIS OF METADATA","authors":"C. C. Miller, M. Nadal, B. Tsai","doi":"10.25039/X46.2019.OP29","DOIUrl":"https://doi.org/10.25039/X46.2019.OP29","url":null,"abstract":"The National Institute of Standards and Technology (NIST) began to offer proficiency testing for Solid-State Lighting (SSL) products through a Measurement Assurance Program (MAP) in 2010. This article communicates the results of the first version of the MAP in which 118 worldwide laboratories participated. Statistical analysis of how the laboratories’ measurements compared to NIST’s measurements are presented. In general, all the laboratory results are within +/- 4 % for total luminous flux and luminous efficacy measurements. The discussion provides reasons for any discrepancies or large uncertainty intervals found in the data. A major finding was that measurement differences of RMS current had a larger standard deviation and number of outliers than expected. Two possible explanations are (1) the discrepancies are due to issues with using 4-pole sockets, and (2) the large deviation is caused by some solid state lamps being sensitive to impedance and slew rate of AC power supplies.","PeriodicalId":121032,"journal":{"name":"PROCEEDINGS OF the 29th Quadrennial Session of the CIE","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125150901","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}
G. Eppeldauer, V. Podobedov, C. Cooksey, L. Hanssen
{"title":"PYROELECTRIC STANDARDS FOR SPECTRAL AND BROADBAND RESPONSIVITY MEASUREMENTS FROM 210 NM TO 3000 NM","authors":"G. Eppeldauer, V. Podobedov, C. Cooksey, L. Hanssen","doi":"10.25039/X46.2019.OP59","DOIUrl":"https://doi.org/10.25039/X46.2019.OP59","url":null,"abstract":"","PeriodicalId":121032,"journal":{"name":"PROCEEDINGS OF the 29th Quadrennial Session of the CIE","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126111022","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}
{"title":"STUDY ON IMPROVEMENT OF LOW POSITION ROAD LIGHTING INSTALLATIONS IN A POOR VISUAL RANGE","authors":"Y. Karasawa, Hiroo Wada","doi":"10.25039/X46.2019.PO177","DOIUrl":"https://doi.org/10.25039/X46.2019.PO177","url":null,"abstract":"","PeriodicalId":121032,"journal":{"name":"PROCEEDINGS OF the 29th Quadrennial Session of the CIE","volume":"167 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123275177","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}
{"title":"SHADE-FREE TEXTURE ACQUISITION FOR 3D SCANNING SYSTEM","authors":"Tzung-Han Lin, K. L. Chan, H. Chen","doi":"10.25039/X46.2019.PP07","DOIUrl":"https://doi.org/10.25039/X46.2019.PP07","url":null,"abstract":"","PeriodicalId":121032,"journal":{"name":"PROCEEDINGS OF the 29th Quadrennial Session of the CIE","volume":"32 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123799514","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}
Chao-Hua Wen, S. Hung, Kai-Chieh Chang, Zong-Huei Tsai, Cheng‐Hsien Chen
{"title":"GLARE ASSESSMENT FOR LOW-REFLECTION DISPLAY DEVICES","authors":"Chao-Hua Wen, S. Hung, Kai-Chieh Chang, Zong-Huei Tsai, Cheng‐Hsien Chen","doi":"10.25039/X46.2019.PO164","DOIUrl":"https://doi.org/10.25039/X46.2019.PO164","url":null,"abstract":"","PeriodicalId":121032,"journal":{"name":"PROCEEDINGS OF the 29th Quadrennial Session of the CIE","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126634173","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}
Insufficient stray light rejection of array spectroradiometers, in especially the UV spectral range, limits the application of these devices. One important example would be UV hazard measurements. This study shows that a combination of different stray light corrections methods can improve the stray light reduction performance of UV array spectroradiometers significantly, to meet these requirements. The ACGIH Eeff (identical ICNIRP) values measured with an uncorrected array spectroradiometer showed expected large deviations of 73% for a sunbed tanning lamp and 105% for a halogen lamp, relative to a double monochromator reference. With the applied combined Out-of-Range and In-Band stray light correction method, these measurements were within 3% of the reference double monochromator based system. Furthermore, the measurements showed a detection limit of 2E-5 W/m2/nm for the double monochromator and comparable 3E-5 W/m2/nm for the stray light corrected array spectroradiometer. This was in contrast to 5E-4 W/m2/nm for the uncorrected array spectroradiometer. The results suggest that photobiological safety measurements according to IEC / DIN EN 62471 are possible with the applied combined stray light correction method for the used spectroradiometer.
阵列光谱辐射计的杂散光抑制能力不足，特别是在紫外光谱范围内，限制了这些器件的应用。一个重要的例子是紫外线危害测量。本研究表明，不同杂散光校正方法的组合可以显著提高紫外阵列光谱仪的杂散光抑制性能，以满足这些要求。用未校正的阵列光谱辐射计测量的ACGIH Eeff(相同的ICNIRP)值显示，相对于双单色参考，太阳浴床晒黑灯和卤素灯的预期偏差分别为73%和105%。结合应用的超距离和带内杂散光校正方法，这些测量值在参考双单色仪系统的3%以内。此外，测量结果表明，双单色仪的检测限为2E-5 W/m2/nm，杂散光校正阵列光谱仪的检测限为3E-5 W/m2/nm。这与未校正阵列光谱辐射计的5E-4 W/m2/nm形成对比。结果表明，根据IEC / DIN EN 62471的光生物安全性测量是可能的，使用组合杂散光校正方法用于所使用的光谱辐射计。
{"title":"COMBINED OUT OF RANGE AND IN BAND STRAY LIGHT CORRECTION FOR ARRAY SPECTRORADIOMETERS","authors":"R. Zuber, Mario Ribnitzky","doi":"10.25039/X46.2019.OP76","DOIUrl":"https://doi.org/10.25039/X46.2019.OP76","url":null,"abstract":"Insufficient stray light rejection of array spectroradiometers, in especially the UV spectral range, limits the application of these devices. One important example would be UV hazard measurements. This study shows that a combination of different stray light corrections methods can improve the stray light reduction performance of UV array spectroradiometers significantly, to meet these requirements. The ACGIH Eeff (identical ICNIRP) values measured with an uncorrected array spectroradiometer showed expected large deviations of 73% for a sunbed tanning lamp and 105% for a halogen lamp, relative to a double monochromator reference. With the applied combined Out-of-Range and In-Band stray light correction method, these measurements were within 3% of the reference double monochromator based system. Furthermore, the measurements showed a detection limit of 2E-5 W/m2/nm for the double monochromator and comparable 3E-5 W/m2/nm for the stray light corrected array spectroradiometer. This was in contrast to 5E-4 W/m2/nm for the uncorrected array spectroradiometer. The results suggest that photobiological safety measurements according to IEC / DIN EN 62471 are possible with the applied combined stray light correction method for the used spectroradiometer.","PeriodicalId":121032,"journal":{"name":"PROCEEDINGS OF the 29th Quadrennial Session of the CIE","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115995548","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}
{"title":"A MEASUREMENT METHOD OF SPATIAL ILLUMINANCE DISTRIBUTION FOR AN OUTDOOR STADIUM MAKING USE OF A QUADCOPTER","authors":"Hirotaka Suzuki, M. Iwata, Y. Akizuki","doi":"10.25039/X46.2019.PO109","DOIUrl":"https://doi.org/10.25039/X46.2019.PO109","url":null,"abstract":"","PeriodicalId":121032,"journal":{"name":"PROCEEDINGS OF the 29th Quadrennial Session of the CIE","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122887966","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}
Ambient light is taken more into account in today’s lighting design as it has a major impact on human well-being as well as reduction of glare. LED lighting provides new opportunities to design more efficient lighting systems in terms of improved color rendering and possibilities to vary the color temperature in order to mimic daylight. Today there is a trend to use dynamic lighting in working environments to set the circadian rhythm by varying the CCT over the day by using higher colour temperatures and illuminance levels in the morning and lowering the values in the afternoon toward night. This study investigated preferred color temperatures within an ordinary workplace area using various light levels and different ratios between task area and the ambient light in a laboratory environment. Furthermore we also compared different age groups and gender in order to examine if there were any such differences in preferences.
{"title":"PREFERRED COLOUR TEMPERATURES OF AMBIENT LIGHT AT DIFFERENT LIGHT LEVEL SETTINGS","authors":"T. Govén, T. Laike","doi":"10.25039/X46.2019.PO128","DOIUrl":"https://doi.org/10.25039/X46.2019.PO128","url":null,"abstract":"Ambient light is taken more into account in today’s lighting design as it has a major impact on human well-being as well as reduction of glare. LED lighting provides new opportunities to design more efficient lighting systems in terms of improved color rendering and possibilities to vary the color temperature in order to mimic daylight. Today there is a trend to use dynamic lighting in working environments to set the circadian rhythm by varying the CCT over the day by using higher colour temperatures and illuminance levels in the morning and lowering the values in the afternoon toward night. This study investigated preferred color temperatures within an ordinary workplace area using various light levels and different ratios between task area and the ambient light in a laboratory environment. Furthermore we also compared different age groups and gender in order to examine if there were any such differences in preferences.","PeriodicalId":121032,"journal":{"name":"PROCEEDINGS OF the 29th Quadrennial Session of the CIE","volume":"238 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114398460","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}
Y. Akashi, T. Miyazaki, Hiroo Maeda, Shibata Yuichi, H. Ishida
To identify lighting requirements for ADB systems to help drivers detect off-axis potential hazards when oncoming headlight glare exists in a night-time roadway, we conducted target detection tests under various experimental conditions in a laboratory. In the experiment, we used a simulated ADB system which can illuminate only targets locally and therefore increase the luminance contrasts of the targets. The experimental results suggest that the ADB system is more efficient lighting methods than conventional forward lighting systems which illuminate the entire visual field to increase drivers’ adaptation luminance levels. Based on the detection rates, we also determined requirements for threshold luminance contrast for targets with oncoming headlight glare.
{"title":"LIGHTING REQUIREMENTS FOR ADAPTIVE DRIVING BEAM (ADB) TO IMPROVE TARGET VISIBILITY WHEN ONCOMING HEADLIGHT GLARE EXISTS","authors":"Y. Akashi, T. Miyazaki, Hiroo Maeda, Shibata Yuichi, H. Ishida","doi":"10.25039/X46.2019.PP21","DOIUrl":"https://doi.org/10.25039/X46.2019.PP21","url":null,"abstract":"To identify lighting requirements for ADB systems to help drivers detect off-axis potential hazards when oncoming headlight glare exists in a night-time roadway, we conducted target detection tests under various experimental conditions in a laboratory. In the experiment, we used a simulated ADB system which can illuminate only targets locally and therefore increase the luminance contrasts of the targets. The experimental results suggest that the ADB system is more efficient lighting methods than conventional forward lighting systems which illuminate the entire visual field to increase drivers’ adaptation luminance levels. Based on the detection rates, we also determined requirements for threshold luminance contrast for targets with oncoming headlight glare.","PeriodicalId":121032,"journal":{"name":"PROCEEDINGS OF the 29th Quadrennial Session of the CIE","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128206515","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}
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