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- 2018
- sodium lighting system
- modeling
- radiation curves
- LED lighting system
- software goniophotometer
- upper half-space
- light-emitting diode (LED)
- bulb's replacement
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- light sources for household
- Electrical Engineering and Automation
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- Central Institute for Labour Protection - National Research Institute
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The Effects of Lighting Problems on Eye Symptoms among Cleanroom Microscope Workers
摘要： The visual health of microscope workers is an important occupational health concern, and a previous study suggested an association between lighting problems (e.g., ?ashing light, insuf?cient lighting) and eye symptoms among cleanroom workers in the electronics industry. This study aimed to explore the association between eye symptoms and lighting problems, as well as light-related counteracting behaviors among microscope workers in the cleanroom environment. Ninety-one cleanroom workers aged 20 years or older were recruited from an electronics factory. The socio-demographic factors, work-related factors, eye symptoms, and lighting problems were assessed using a self-administered questionnaire. There were 92.3% female participants in this study. Among all participants, 41.8% and 63.7% had symptoms of dry eye and eye fatigue, respectively. The counteracting behaviors of needing to move closer (adjusted odds ratio (aOR) = 3.47, 95% CI = 1.11 to 10.88) was signi?cantly associated with dry eye symptoms. Workers who were more experienced at the job (aOR = 1.03, 95% CI = 1.01 to 1.06) and had shorter break times (aOR = 0.94, 95% CI = 0.91 to 0.98) were more likely to have eye fatigue. As a result of these ?ndings, this study suggests that good lighting and adequate break times are crucial to improve the visual health of cleanroom microscope workers.
关键词： cleanroom,visual health,microscope,lighting
更新于2025-09-23 15:22:29
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Influence of lighting colour temperature on indoor thermal perception: A strategy to save energy from the HVAC installations
摘要： This paper examines how the lighting colour temperature affects indoor thermal comfort. A test room with three separate environments was set and, in each one of them, a lamp with a different colour temperature was positioned to evaluate the influence of a cold, neutral and warm light. The colour temperatures of the used lamps were 11,530 K, 4,000 K and 1,772 K respectively. During each test, while complying with the EN 12464-1, a lighting level of 500 lx and a uniformity coefficient higher than or equal to 0.7 were maintained. With an air temperature of about 22 °C, 42 people were interviewed and filled a questionnaire structured according to the ISO 10551 to judge the resulting thermal comfort. The study reported a certain influence of the lighting colour temperature on people’s thermal perception which was only lower than the one related to the gender. With respect to the ASHRAE 7-point scale, being exposed to the different types of light led to a decrease (0.44 units under cold light) in the mean value of the votes given by the interviewees to judge their thermal perception. Such condition gives the possibility to increase, without varying the thermal perception of the subjects, the air temperature of 1.25 °C, 0.46 °C and 0.23 °C with cold, neutral and warm light respectively. Finally a cross tabulation analysis was performed to compare the votes of the participants before and after they were exposed to the different lights with those predicted by the Predicted Mean Vote (PMV).
关键词： PMV,Field survey,Lighting colour temperature,Thermal perception,Indoor thermal comfort
更新于2025-09-23 15:22:29
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Prediction of excitation wavelength of phosphors by using machine learning model
摘要： Luminescent materials are the integral part of green revolution helping us in saving the energy. Much effort been made to design and discover the novel phosphors for solid-state lighting. The current paper focuses on the development of machine learning (ML) model based on simple luminescent materials to predict the excitation to the closest possible accuracy using easily accessible key attributes using least absolute shrinkage and selection operator (LASSO) and artificial neural network (ANN) ML approach. These selected attributes expected to correlate with the excitation of material. The style for studying the material property has the potential to turn down the cost and time involved in an Edisonian approach to the lengthy lab experiment to identify excitation.
关键词： Solid-state lighting,Phosphor,Machine learning,Excitation wavelength,Luminescence
更新于2025-09-23 15:22:29
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[ACM Press SIGGRAPH Asia 2018 Technical Briefs - Tokyo, Japan (2018.12.04-2018.12.07)] SIGGRAPH Asia 2018 Technical Briefs on - SA '18 - Fast raycasting using a compound deep image for VPL range determination
摘要： The concept of using multiple deep images has been explored, under a variety of different names, as a possible acceleration approach for finding ray-geometry intersections. We leverage recent advances in deep image processing from Order Independent Transparency (OIT) for fast building of a Compound Deep Image (CDI) using a coherent memory format well suited for raycasting. We explore the use of a CDI and raycasting for the problem of determining distance between Virtual Point Lights (VPLs) and geometry for indirect lighting, with the raycasting step being a small fraction of total frametime.
关键词： deep image,indirect lighting,ray casting
更新于2025-09-23 15:22:29
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Deducing the Optimal Control Method for Electrochromic Triple Glazing through an Integrated Evaluation of Building Energy and Daylight Performance
摘要： Electrochromic glass is anticipated as the next generation of solar control glass for construction because it can control the transmittance of the glass itself. This study analyzed building energy and light environment performance by applying electrochromic glass in triple glazing in order to verify both the solar control characteristics of electrochromic glass and its high insulation performance. This paper evaluates the performance of the electrochromic glass developed by our research team in Korea in five control conditions of varying temperatures and solar radiation levels. By analyzing the cooling and heating load, lighting energy, Daylight Glare Index (DGI), and interior illuminance when applying the selected conditions to office buildings, this paper discerns the optimal control conditions for electrochromic glass. To do so, the optical characteristic data of the electrochromic glass was analyzed via an experiment, and the creation of triple glazing for construction was conducted. The performance of electrochromic glass was evaluated by analyzing hourly and yearly data for cooling, heating load, and lighting energy during a typical day in summer and winter. From this analysis, the control condition with an outstanding performance from an energy perspective was identified. The performance of the light environment was assessed, and the EDPI overall evaluation index was used to find the electrochromic glass’ optimum control conditions for integrating energy and light environment.
关键词： electrochromic glazing,EnergyPlus,optical properties,lighting energy,office building,heating and cooling loads,optimum control
更新于2025-09-23 15:22:29
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[IEEE 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Trebic, Czech Republic (2018.9.18-2018.9.20)] 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Directions of Research and Standardization in the Field of Outdoor Lighting
摘要： This paper aims to highlight current trends in research and standardization in light and lighting with focus on the outdoor lighting. Activities of the International Commission on Illumination (CIE) are briefly presented and detailed in selected topics picked up from the list of research priorities. The highlighted topics comprise adaptive lighting, tailored lighting, new lighting metrics, maintenance factor and obtrusive light issues in particular. Outlook for standardization items, priorities and strategy is outlined in the paper.
关键词： obtrusive light,smart lighting,research,outdoor lighting,maintenance factor,standardization,tailored lighting,light and lighting,adaptive lighting
更新于2025-09-23 15:21:21
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[IEEE 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Trebic, Czech Republic (2018.9.18-2018.9.20)] 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Modern Lighting Audits - Technology Supporting Designers and Contractors to Verify Lighting Installation Quality
摘要： This paper provides a detailed description of a novel solution which combines the CAD lighting design software with the on-site measurement. New technology illuminance spectroradiometers able to handle measurement procedure to verify lighting levels and other quality measures using CAD plans as a reference and reporting illuminance level back to the design software. It also discusses the use of Imaging Luminance Measurement Devices in the practical verification of luminance levels inside and outside buildings. Available design tools support designers with calculation and simulation of luminance levels but little is available when the onsite software and hardware tools are available for onsite verification. This is especially critical for verification of architectural and road lighting installation.
关键词： lighting evaluation,verifying lighting levels,lighting audits,illuminance spectroradiometers,Imaging Luminance Measurement Devices
更新于2025-09-23 15:21:21
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[IEEE 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Trebic, Czech Republic (2018.9.18-2018.9.20)] 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - The Floodlighting Design System Based on the Object's Daytime Photography
摘要： The article presents a solution to the problem of work and time consuming of the objects floodlighting projects creation. Currently, the only technically correct methods for creating such projects are a three-dimensional computer simulation using photometric files of luminaires or field trials using real equipment. Both of these methods have their advantages, but also many disadvantages. Among architects, in turn, a popular method of floodlighting designing is graphic processing of daytime or evening images objects. The method is relatively fast and it gives photorealistic effects but it is technically incorrect. An architect or graphic designer creates a picture that is attractive to the eye, but usually has nothing to do with reality. This is due to the fact that the lighting parameters of both lighting equipment and analyzing this type of project in terms of technology are not taken into account. The article presents a solution to this problem. It describes a system created especially for this purpose based on a dedicated computer application that allows simulation of the object floodlighting using its daily photograph. This is technically correct simulation, because it uses photometric files of luminaires. The system allows correction of basic photometric parameters: editing of photometric files, luminous flux, light in different directions, color temperature and the use of color filters. The computer application also enables photo editing, geometric correction, measurement and defining reflection and transmission properties of materials from which the object is actually built. Full lighting analysis is also possible and is based on luminance and illuminance distributions generated in the false color scale and measurements in points and selected areas. The advantages, disadvantages and limitations of the developed system are presented.
关键词： luminance distribution,visualization,floodlighting,advanced lighting simulation,lighting design
更新于2025-09-23 15:21:21
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[IEEE 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Trebic, Czech Republic (2018.9.18-2018.9.20)] 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Impact of Direct Lighting Luminaires' Luminous Intensity Distribution on Lighting Quality in Interiors
摘要： Luminous intensity distribution of luminaires influences the qualitative metrics of lighting. Direct lighting is the most common way of illumination in public interiors. Thus, its application should be carefully considered. For defined luminous intensity distributions of direct lighting luminaires and their layouts, in rooms with various sizes and reflectances, the ceiling and wall illuminance ratios, and UGR values were calculated and analysed in detail. Meeting the recommendations for ceiling and wall illumination, and discomfort glare were checked. Impact of luminous intensity distribution of the direct lighting luminaires on ceiling and wall illumination, and discomfort glare was assessed. Impact of room size and reflectances on ceiling and wall illumination, and discomfort glare was also observed. Substantial limitation of for general lighting illumination in interiors was demonstrated and it should be regarded with great concern if visual comfort for people in interiors is to be provided.
关键词： luminous intensity distribution,luminaire,lighting quality,interior lighting
更新于2025-09-23 15:21:21
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[IEEE 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Trebic, Czech Republic (2018.9.18-2018.9.20)] 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Radiation of the Luminous Flux Into the Upper Half-Space in Wils - Building Design
摘要： The article focuses on the further verification of the software goniophotometer in the BUILDING DESIGN computational program in terms of the possibility of calculating the radiation of the liminous flux flowing into the upper half- space from public lighting systems [1]. Software goniophotometer was tested by the previous verification for the accuracy of calculations of the direct and indirect component of luminaire luminous flux. The superstructure was conceived as the possibility of inserting a network of calculating points in the shape of a sphere. We can imagine the points showing normal illuminance towards the centre of the sphere as a lux meter sensor. The system thus designed duplicates the function of a real goniophotometer, a photometric laboratory instrument that measures luminous intensity or luminous intensity curves. The principle of a goniophotometer is that it allows to measure the luminous intensity in different planes and at different angles, which can be easily interpreted by a sphere with a network of calculation points. The density of the calculation points can be entered in an angular step according to the standard luminaire measurement plan C, γ. The goal of implementing such a network of calculation points is to extend the possibilities of a computational program for modelling the luminous intensity curves of existing luminaires as well as newly composed luminaires. The main goal is calculating the radiation of the liminous flux flowing into the upper half-space from the outdoor lighting systems. It will be the basis for further astronomical calculations that focus on distracting light and increased sky luminance. Based on the testing, it will be possible to create model of lighting system in some city or district of the city by inserting LDT data of real luminaires, thus creating a real lighting system with real building models. From the resulting model, it will be possible to quantify the proportion of the direct and indirect luminous flux flowing into the upper half-space.
关键词： sodium lighting system,modeling,radiation curves,LED lighting system,software goniophotometer,upper half-space
更新于2025-09-23 15:21:21