Lighting Research & Technology最新文献_第6页

Determining scalar illuminance from cubic illuminance data. Part 2: Tests in real lighting environments and an approach to improve its accuracy 从三次照度数据确定标量照度。第2部分:在真实照明环境中的测试和提高其准确性的方法

IF 2.5 3区工程技术

Lighting Research & Technology Pub Date : 2022-08-29 DOI: 10.1177/14771535221086667

L. Xia, Y. Gu, X. Liu, T. Zhang, R. Xu

{"title":"Determining scalar illuminance from cubic illuminance data. Part 2: Tests in real lighting environments and an approach to improve its accuracy","authors":"L. Xia, Y. Gu, X. Liu, T. Zhang, R. Xu","doi":"10.1177/14771535221086667","DOIUrl":"https://doi.org/10.1177/14771535221086667","url":null,"abstract":"Scalar illuminance, which describes the constant illumination from all directions, is an important indicator of the abundance of light for a lit object and the adequacy of illumination perceived. This paper proposes a more reliable method to recover scalar illuminance based on tests in natural complex lighting environments. The performance of Cuttle’s Approach 1, Mangkuto’s Approach 2 and Approach 3, together with Xia et al.’s potential Approach 4, were tested under a total of 610 high dynamic range (HDR) panoramic maps of real scenes. The relationships between predicted scalar illuminance and normalised diffuseness levels were checked. The results indicate that the potential Approach 4 is more robust to the cubic meter’s postures, and the predicted scalar illuminance has a regular relationship with normalised diffuseness levels. Approach 4 was corrected, together with Approach 1, formulating a new method named Approach 5S. Later, the proposed Approach 5S was evaluated under 205 indoor and 2233 outdoor panoramas from the Laval HDR databases, and it was shown to recover more reliable scalar illuminance with an average error within 5% in general. This study has provided a practical solution to more accurate vector illuminance-based metrics in real lighting environments. This algorithm can be further integrated into the development of cubic illumination meter instruments.","PeriodicalId":18133,"journal":{"name":"Lighting Research & Technology","volume":"55 1","pages":"62 - 78"},"PeriodicalIF":2.5,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81927115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of evening light exposure on polysomnographically assessed night-time sleep: A systematic review with meta-analysis 夜间光照对多导睡眠描记仪评估的夜间睡眠的影响:一项系统综述和荟萃分析

IF 2.5 3区工程技术

Lighting Research & Technology Pub Date : 2022-08-05 DOI: 10.1177/14771535221078765

C. Cajochen, O. Stefani, I. Schöllhorn, D. Lang, SL Chellappa

{"title":"Influence of evening light exposure on polysomnographically assessed night-time sleep: A systematic review with meta-analysis","authors":"C. Cajochen, O. Stefani, I. Schöllhorn, D. Lang, SL Chellappa","doi":"10.1177/14771535221078765","DOIUrl":"https://doi.org/10.1177/14771535221078765","url":null,"abstract":"Evening exposure to electric light can acutely suppress melatonin levels and adversely affect subsequent sleep. We conducted a systematic review with meta-analysis investigating the influence of evening illuminance levels on polysomnographically (PSG)-assessed sleep. We also explored how melanopsin (expressed in melanopic equivalent daylight illuminance (EDI) affects human sleep features. We included polysomnographic laboratory sleep studies with healthy humans for effects of illuminance and exposure duration, for pre-sleep exposures between 6:00 p.m. to 1:00 a.m. From 440 identified articles, 114 met eligibility criteria for screening, and 21 also reported type of light source/spectral characteristics, with 12 identified as eligible for review. Meta-analysis showed evening light affects sleep latency, sleep efficiency and slow wave sleep, with overall effect sizes (95% confidence interval) of 0.69 (−0.50; 1.88), 0.34 (−0.13; 0.82) and −0.61 (−1.85; 0.62), respectively. Estimated melanopic EDI in the range of 100–1000 lx yielded clear dose–response relationships for sleep latency and sleep efficiency, but not for slow wave sleep. Whilst illuminance and duration indicated no apparent effects for a single evening light exposure on PSG-assessed sleep latency, sleep efficiency and slow wave sleep, we observed evidence for a relationship between light exposure and sleep effects based on melanopic EDI. Hence, melanopic EDI may provide a robust predictor of non-visual responses on human sleep.","PeriodicalId":18133,"journal":{"name":"Lighting Research & Technology","volume":"10 1","pages":"609 - 624"},"PeriodicalIF":2.5,"publicationDate":"2022-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90074041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Flicker: A review of temporal light modulation stimulus, responses, and measures 闪烁:时间光调制刺激、反应和措施的综述

IF 2.5 3区工程技术

Lighting Research & Technology Pub Date : 2022-08-04 DOI: 10.1177/14771535211069482

N. Miller, F. Leon, J. Tan, L. Irvin

{"title":"Flicker: A review of temporal light modulation stimulus, responses, and measures","authors":"N. Miller, F. Leon, J. Tan, L. Irvin","doi":"10.1177/14771535211069482","DOIUrl":"https://doi.org/10.1177/14771535211069482","url":null,"abstract":"Flicker has been an important lighting system consideration for over a century. More precise terms are temporal light modulation (TLM) as the stimulus, and responses to TLM as the unwanted visual, cognitive, or physiological consequences. As lighting technology evolved, different forms of TLM emerged, and so did responses to them. Today, some LED systems – encompassing the LED, driver, and control – can result in TLM causing severe unwanted effects, while other LED systems produce no unwanted effects at all. LED systems can deliver a much wider range of luminous waveforms than conventional lighting systems, some exhibiting very high modulation depths. More than any light source before, they can elicit perceptions of the phantom array. Direct flicker effects at modulation frequencies less than about 80 Hz and the stroboscopic effect at frequencies greater than 80 Hz are fairly well understood, but the phantom array effect needs more exploration and characterisation. This review focuses on the technology and research history that led to current metrics for quantifying TLM and human responses to TLM. Visually impaired individuals may exhibit alterations in their response to TLM, but such a discussion is beyond the intent of this review. Thus, the focus is on individuals with normal visual function.","PeriodicalId":18133,"journal":{"name":"Lighting Research & Technology","volume":"63 4","pages":"5 - 35"},"PeriodicalIF":2.5,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72496930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Corrigendum to Redistribution of luminance patterns on standard sky types 重新分配标准天空类型的亮度模式的勘误表

IF 2.5 3区工程技术

Lighting Research & Technology Pub Date : 2022-08-01 DOI: 10.1177/14771535221100341

引用次数: 0

Lighting measurement with a 360° panoramic camera: Part 1 – Technical procedure and validation 360°全景摄像机照明测量。第1部分。技术程序和验证

IF 2.5 3区工程技术

Lighting Research & Technology Pub Date : 2022-07-24 DOI: 10.1177/14771535221101557

H. Li, H. Cai

{"title":"Lighting measurement with a 360° panoramic camera: Part 1 – Technical procedure and validation","authors":"H. Li, H. Cai","doi":"10.1177/14771535221101557","DOIUrl":"https://doi.org/10.1177/14771535221101557","url":null,"abstract":"This study developed a 360° field of view (FOV) lighting measurement method with the aid of the Ricoh Theta Z1 panoramic camera. As versatile lighting information from all viewing directions within 360° FOV can be retrieved from a single 360° high dynamic range (HDR) image, this new method improves the lighting measurement efficiency. Part 1 of this study reported in the present paper focuses on technical procedure and validation. Firstly, all technical issues were solved for using the Theta Z1 camera to conduct 360° FOV lighting measurement with a provided and validated step-by-step procedure. A new illuminance measurement method was then developed with the aid of the Theta Z1 camera for calculating all directional illuminance data at the camera measurement point from any viewing direction within the 360° panoramic FOV, retrieved from a single 360° HDR image taken in the field. This 360° FOV lighting measurement method has average error rate of 4.0% ± 2.4% for luminance measurement and 3.1% ± 2.6% for illuminance measurement in building interiors. Reported outcomes include the detailed procedure and algorithms for the configuration, calibrations and post-image processing, and corresponding MATLAB code and Python programs are shared online.","PeriodicalId":18133,"journal":{"name":"Lighting Research & Technology","volume":"1 1","pages":"694 - 711"},"PeriodicalIF":2.5,"publicationDate":"2022-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82204279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

A generic, visual system-based model for discomfort from glare 一个通用的，视觉系统为基础的模型不适眩光

IF 2.5 3区工程技术

Lighting Research & Technology Pub Date : 2022-07-23 DOI: 10.1177/14771535221112675

M. Vissenberg, M. Perz, M. Donners, D. Sekulovski

引用次数: 1

Editorial: What can we learn from the lighting in homes? 社论:我们能从家庭照明中学到什么?

IF 2.5 3区工程技术

Lighting Research & Technology Pub Date : 2022-07-21 DOI: 10.1177/14771535221115944

Michael P. Royer

引用次数: 0

Colour discrimination scores combining colour fidelity and gamut area characteristics 色彩辨别分数结合色彩保真度和色域面积特征

IF 2.5 3区工程技术

Lighting Research & Technology Pub Date : 2022-07-21 DOI: 10.1177/14771535221094277

D. Hou, Y. Ni, Y. Wang, C. Weirich, H. Shen, Y. Lin

{"title":"Colour discrimination scores combining colour fidelity and gamut area characteristics","authors":"D. Hou, Y. Ni, Y. Wang, C. Weirich, H. Shen, Y. Lin","doi":"10.1177/14771535221094277","DOIUrl":"https://doi.org/10.1177/14771535221094277","url":null,"abstract":"This paper investigated colour discrimination based on current available indexes, and predictors were proposed for global and targeted colour scenarios. Thirty participants conducted the Farnsworth–Munsell 100 hue test under 21 lighting conditions. The experiment results revealed that the distribution of total error score (TES) and adjusted total error score (TESadj) showed arc shapes centred on the optimal point (100, 100) in both Rf–Rg and colour rendering index–gamut area index coordinate systems. On this basis, global colour discrimination scores, CDS1 and CDS2, based on the colour fidelity and colour gamut characteristics, were proposed. The results demonstrated that both CDS1 (r = 0.82, p < 0.001) and CDS2 (r = 0.81, p < 0.001) provided good linear correlations with TES, and CDS1 (r = 0.75, p < 0.001) and CDS2 (r = 0.77, p < 0.001) also exhibited a good linear correlation with TESadj. Furthermore, the global colour gamut was divided into four local colour spaces (red–yellow, yellow–green, green–blue and blue–red), and the CDSs in the local gamut (CDSlocal and CDSadj,local) were constructed using the local colour properties, including Rcs,local, Rhs,local and Rf,local. The linear regression results demonstrated that CDSlocal ( r ¯ = 0 . 79 ) and CDSadj,local ( r ¯ = 0 . 78 ) can be effective colour discrimination predictors for the targeted colour scenarios.","PeriodicalId":18133,"journal":{"name":"Lighting Research & Technology","volume":"96 1","pages":"129 - 154"},"PeriodicalIF":2.5,"publicationDate":"2022-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85259393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of advance light exposure on assembly-line workers’ subjective work alertness and sleep quality 提前光照对装配线工人主观工作警觉性和睡眠质量的影响

IF 2.5 3区工程技术

Lighting Research & Technology Pub Date : 2022-07-15 DOI: 10.1177/14771535221078763

S. He, Y. Yan

{"title":"Impact of advance light exposure on assembly-line workers’ subjective work alertness and sleep quality","authors":"S. He, Y. Yan","doi":"10.1177/14771535221078763","DOIUrl":"https://doi.org/10.1177/14771535221078763","url":null,"abstract":"Underexposure to daylight in windowless factories puts assembly-line workers at risk of health problems. To investigate whether the advance light exposure in the early morning and during the lunch break benefits workers’ productivity and night-time sleep, a within-subject experiment was conducted in a factory. Four experimental lighting interventions were provided twice a day before work (8:30–9:00 and 12:00–12:30) for consecutive five workdays, covering two light levels (1440 lx vs. 70 lx), each with two correlated colour temperatures (CCTs) (5300 K vs. 3300 K), plus an additional benchmark dark exposure (4 lx). Participants’ subjective alertness and night-time sleep were measured daily, and the chronotype was monitored once a week. Results showed that a higher illuminance was correlated with increased subjective work alertness and higher sleep efficiency, while a lower CCT slightly improved alertness. The subjective work alertness and sleep efficiency under the two advance bright light exposures were higher than those under the dark exposure, and the responses of subjective alertness were more pronounced in the afternoon than those in the morning. Yet, the chronotype had no evident change in different lighting interventions. The present study indicated that the daily advance light exposure before work could have a delayed effect on participants’ alertness and sleep quality.","PeriodicalId":18133,"journal":{"name":"Lighting Research & Technology","volume":"44 1","pages":"105 - 128"},"PeriodicalIF":2.5,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78566354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Colour imaging system response non-uniformity correction based on inverse model and regularization method 基于逆模型和正则化方法的彩色成像系统响应非均匀性校正

IF 2.5 3区工程技术

Lighting Research & Technology Pub Date : 2022-07-13 DOI: 10.1177/14771535221094737

X. Xie, Q. Sun, J. Gong, N. Liao, W. Song

引用次数: 0