Relevant bibliographies by topics / Daylight metric

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Daylight metric'

Author: Grafiati
Published: 14 March 2023
Last updated: 31 July 2025

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Journal articles on the topic "Daylight metric"

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Dogan, T., and YC Park. "Testing the residential daylight score: Comparing climate-based daylighting metrics for 2444 individual dwelling units in temperate climates." Lighting Research & Technology 52, no. 8 (2020): 991–1008. http://dx.doi.org/10.1177/1477153520924838.

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Evaluation metrics using climate-based daylight modelling paradigms have become the de-facto standard in work environments but have only limited applicability in residential architecture. Qualities of daylight cited in the architectural design literature, such as daily and seasonal availability of daylight as well as access to direct sunlight, are simulated in detail but are usually overlooked in the commonly used evaluation metrics. In a recent paper, a new climate-based, annual daylight evaluation framework called the residential daylight score has been proposed for cold and temperate climat
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Gábrová, Lenka. "Comparison between Dynamic and Static Metrics for Daylight Evaluation in the Case of Obstructed Buildings." Applied Mechanics and Materials 861 (December 2016): 477–84. http://dx.doi.org/10.4028/www.scientific.net/amm.861.477.

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Daylight in buildings can be evaluated using dynamic and static daylight metrics. The daylight factor is a static daylight metric which evaluates daylight conditions under the overcast sky model according to the International Commission on Illumination. However, the dynamic daylight metrics (e.g. daylight autonomy, spatial daylight autonomy, useful daylight illuminance) can be more complex evaluation criteria because they are based on annual daylight illuminance data for a building site. While the daylight factor value depends only on a room geometry, optical properties of surfaces and positio
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Lee, Jaewook, and Mohamed Boubekri. "INTRODUCTION OF NEW DAYLIGHTING METRICS FOR HEALTH, WELLBEING, AND FEASIBILITY: A STUDY OF THE INDOOR BUILDING ENVIRONMENT." Journal of Green Building 17, no. 1 (2022): 105–26. http://dx.doi.org/10.3992/1943-4618.17.1.105.

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ABSTRACT This study investigates the applicability of a new daylighting metric based on human health, an emerging framework for evaluating the effect of daylight on building occupants. Procedures based on modeling annual daylight availability are used to determine the mapping of daylight distribution on a daily, seasonal, and yearly basis. Literature review and experimental studies were performed to propose the new day-lighting metrics for health and wellbeing. The proposed metrics have two broad criteria, including daylighting level, timing, and duration. The two details are as follows: (1) 4
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Lee, Jaewook, and Mohamed Boubekri. "INTRODUCTION OF NEW DAYLIGHTING METRICS FOR HEALTH, WELLBEING, AND FEASIBILITY: A STUDY OF THE INDOOR BUILDING ENVIRONMENT." Journal of Green Building 17, no. 1 (2022): 105–26. http://dx.doi.org/10.3992/jgb.17.1.105.

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ABSTRACT This study investigates the applicability of a new daylighting metric based on human health, an emerging framework for evaluating the effect of daylight on building occupants. Procedures based on modeling annual daylight availability are used to determine the mapping of daylight distribution on a daily, seasonal, and yearly basis. Literature review and experimental studies were performed to propose the new day-lighting metrics for health and wellbeing. The proposed metrics have two broad criteria, including daylighting level, timing, and duration. The two details are as follows: (1) 4
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Keskin, Zeynep, Yunhao Chen, and Steve Fotios. "Daylight And Seating Preference In Open-Plan Library Spaces." International Journal of Sustainable Lighting 17 (June 2, 2017): 12–20. http://dx.doi.org/10.26607/ijsl.v17i0.12.

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Daylight factor has long been the predominant metric to evaluate daylight performance. Recently, the profession has moved toward annual dynamic daylight metrics such as useful daylight illuminance and daylight autonomy, which are based on absolute values of time varying daylight illuminance for a period of full year. As opposed to static daylight metrics that only concentrate on individual sky conditions, such as the widely used daylight factor, these metrics provide a more comprehensive way to measure illuminance for a wide range of sun positions and sky conditions. Although there is a growin
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Boubekri, Mohamed, and Jaewook Lee. "A COMPARISON OF FOUR DAYLIGHTING METRICS IN ASSESSING THE DAYLIGHTING PERFORMANCE OF THREE SHADING SYSTEMS." Journal of Green Building 12, no. 3 (2017): 39–53. http://dx.doi.org/10.3992/1943-4618.12.3.39.

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The assessment of the daylighting performance of a design solution is a complex task due to the changing nature of daylight. A few quantitative metrics are available to designers to assess such a performance, among them are the mean hourly illuminance (MHI), the daylight factor (DF), the daylight autonomy (DA) and the useful daylight illuminance (UDI). Each of these metrics has a purpose, a set of criteria and limitations that affect the outcome of the evaluation. When to use one metric instead of another depends largely on the design goals to be achieved. Using Design Iterate Validate Adapt (
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Ruiz, Alejandro, Miguel Ángel Campano, Ignacio Acosta, and Óscar Luque. "Partial Daylight Autonomy (DAp): A New Lighting Dynamic Metric to Optimize the Design of Windows for Seasonal Use Spaces." Applied Sciences 11, no. 17 (2021): 8228. http://dx.doi.org/10.3390/app11178228.

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Nowadays, daylight dynamic metrics are the most useful indicators to quantify the use of natural light, with daylight autonomy (DA) being one of the most widespread among all of them. This metric represents the percentage of the occupied time throughout the year in an indoor space when daylight reaches the minimum illuminance level to develop a specific task. Accordingly, the higher the percentage of DA, the shorter the switching on time of electric lighting. However, this metric considers for its calculations all business days of a whole standard year, and is thus not an accurate indicator fo
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Dogan, T., and YC Park. "A critical review of daylighting metrics for residential architecture and a new metric for cold and temperate climates." Lighting Research & Technology 51, no. 2 (2018): 206–30. http://dx.doi.org/10.1177/1477153518755561.

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Residential architecture constitutes one of the largest market segments in the construction sector. However, the attention that it is given in the field of daylight performance simulation is surprisingly low. This poses the question of whether existing daylighting metrics are well suited for residential design. Findings from 79 references are summarized, and a critical review of current climate-based daylighting metrics in the context of residential architecture is provided. It is found that existing workflows often overlook relevant aspects of daylight in residential spaces, such as diurnal a
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Wienold, J., T. Iwata, M. Sarey Khanie, et al. "Cross-validation and robustness of daylight glare metrics." Lighting Research & Technology 51, no. 7 (2019): 983–1013. http://dx.doi.org/10.1177/1477153519826003.

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This study evaluates the performance and robustness of 22 established and newly proposed glare prediction metrics. Experimental datasets of daylight-dominated workplaces in office-like test rooms were collected from studies by seven research groups in six different locations (Argentina, Denmark, Germany, Israel, Japan and the United States). The variability in experimental setups, locations and research teams allowed reliable evaluation of the performance and robustness of glare metrics for daylight-dominated workplaces. Independent statistical methods were applied to individual datasets and a
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García-Martín, Guillermo, Miguel Ángel Campano, Ignacio Acosta, and Pedro Bustamante. "New Approaches in Dynamic Metrics for Lighting Control Systems: A Critical Review." Applied Sciences 15, no. 15 (2025): 8243. https://doi.org/10.3390/app15158243.

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The growing number of daylighting metrics—often overlapping in scope or terminology—combined with the need for prior familiarization to interpret and apply them effectively, has created a barrier to their adoption beyond academic settings. Consequently, this study analyzes a representative set of established and emerging daylighting metrics to evaluate applicability, synergies, and limitations. Particular attention is given to their implications for occupant health, well-being, performance, and energy use, especially within the context of sensorless smart control systems. A virtual room model
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Dissertations / Theses on the topic "Daylight metric"

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CAMMARANO, SILVIA. "Daylighting design for energy saving in a building global energy simulation context." Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2603987.

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A key factor to substantially reduce the energy consumption for electric lighting consists in a more widespread exploitation of daylight, associated with the use of the most energy efficient lighting technologies, including LEDs or electric lighting controls. At the same time daylight harvesting in indoor spaces can influence the global energy performance of a building also in terms of heating and cooling loads. For this reason, it’s always necessary to account for the balance between daylighting benefits and energy requirements. Furthermore the increasing awareness of the potential benefits o
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Khairy, Al Madhoon Nada. "Improving Daylight Qualities in Medelhavsmuseet." Thesis, KTH, Ljusdesign, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280071.

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The master’s thesis investigates daylight qualities and visitors’ perception in the central atriumof Medelhavsmuseet in Stockholm, Sweden. The investigation started from personal observationof the space where a feeling of darkness was experienced despite the existing skylight.The visitors’ perception of daylight and space were examined through a survey, and it wascompared to daylight simulations where it was proven that the museum’s daylight quality couldbe classified as a minimum. It is suspected that visitor perception of the space was consideredto be bright due to the use of artificial ligh
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Brembilla, Eleonora. "Applicability of climate-based daylight modelling." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/28239.

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This PhD thesis evaluated the applicability of Climate-Based Daylight Modelling (CBDM) as it is presently done. The objectives stated in this thesis aimed at broadly assessing applicability by looking at multiple aspects: (i) the way CBDM is used by expert researchers and practitioners; (ii) how state-of-the-art simulation techniques compare to each other and how they are affected by uncertainty in input factors; (iii) how the simulated results compare with data measured in real occupied spaces. The answers obtained from a web-based questionnaire portrayed a variety of workflows used by differ
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Rahimzadeh, Shahab Din. "Use of parametric modelling and climate-based metrics for the efficient design of daylight strategies in buildings with complex geometries." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/83236/4/Shahab_Rahimzadeh_Thesis.pdf.

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The purpose of this research is to assess daylight performance of buildings with climatic responsive envelopes with complex geometry that integrates shading devices in the façade. To this end two case studies are chosen due to their complex geometries and integrated daylight devices. The effect of different parameters of the daylight devices is analysed through Climate base daylight metrics.
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Rice, Edward Oren. "Daylight in façade renewal : using new metrics to inform the retrofitting of aging modern-ear façade types." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/35496.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Architecture, 2006.<br>Includes bibliographical references (leaves 75-78).<br>New methods for quantifying daylight are increasingly accessible to designers and planners. While these methods have enabled new building facades to better balance the admission of daylight with the maintenance of thermal control, they have generally not been applied to the existing building stock. This project uses these new methods of quantifying daylight to inform the renewal of aging facades on the MIT campus. The goal is to demonstrate how daylight a
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Jakubiec, John Alstan. "The use of visual comfort metrics in the design of daylit spaces." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91295.

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Thesis: Ph. D. in Architecture: Building Technology, Massachusetts Institute of Technology, Department of Architecture, 2014.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 137-144).<br>It is desirable to design buildings with natural daylight and views to the outside, which can maximize passive solar heating, minimize electric lighting use and contribute to feelings of wellbeing and awareness. Unfortunatel
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Borodinova, Baiba. "Inner yard building occupant’s perception versus the computer simulated metrics of daylight : Field study and simulation-based analysis of inner yard building." Thesis, KTH, Ljusdesign, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-233840.

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This Master thesis was aimed at investigating common daylight evaluation methods related to Swedish building codes versus human perception of daylight in residential spaces. Field (interview) and simulation-based study were conducted in one of the typical 20thcentury residential, closed courtyard buildings in Stockholm.   12 residents of Kv. Väktaren 16 were interviewed and simulation models were prepared for the apartments occupied by the participants.   Resident perception of light was mostly contrary to daylight assessing values and methods of daylight factor – DF in a point (CIE overcast s
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Sudhan, Madhu. "Dynamic analysis of daylight metrics and energy saving assessment: modeling and validation." Thesis, 2017. http://localhost:8080/xmlui/handle/12345678/7312.

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Lundgren, Marja. "Performance in the Swedish Building Code : An Inquiry into the Consequences for Architectural Design of the Formulation and Assessment of Performance Requirements." Licentiate thesis, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-257892.

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This thesis investigates performance-based regulation in Sweden and its consequences for architectural design. In the last 50 years, there has been a transition from prescriptive to performance-based regulation, propelled by the drive to further innovation, productivity and competitiveness by expressing the functions expected of the buildings as performances. This thesis examines the promise of freedom in design and solution that this regulatory construction offers, considering two specific performance aspects of the Swedish building code: the requirements regarding energy performance in relat
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Books on the topic "Daylight metric"

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Kwan, Cynthia Hok-Yin. Towards climate-based metrics: A simulation study of annual daylight levels in thirty-one gymnasia. 2009.

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Book chapters on the topic "Daylight metric"

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Parry, C. M. "Quality — The Crucial Metric in Daylight Design." In 1989 2nd European Conference on Architecture. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-017-0556-1_3.

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Arango-Díaz, Lucas, and María Beatriz Piderit-Moreno. "New Dynamic Daylight Metric Based on the Local Context and the Perception of People in the Tropics." In Removing Barriers to Environmental Comfort in the Global South. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-24208-3_16.

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Pereverdieva, Ksenia, Michael Emmerich, André Deutz, Tessa Ezendam, Thomas Bäck, and Hèrm Hofmeyer. "The Prism-Net Search Space Representation for Multi-objective Building Spatial Design." In Lecture Notes in Computer Science. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-27250-9_34.

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AbstractA building spatial design (BSD) determines external and internal walls and ceilings of a building. The design space has a hierarchical structure, in which decisions on the existence or non-existence of spatial components determine the existence of variables related to these spaces, such as sizing and angles. In the optimization of BSDs it is envisioned to optimize various performance indicators from multiple disciplines in concert, such as structural, functional, thermal, and daylight performance. Existing representations of design spaces suffer from severe limitations, such as only re
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Fonseca, Raphaela Walger da, Ethieny Rossato Kramer, Suelem Schier de França, and Fernando Oscar Ruttkay Pereira. "The Daylit Area and the Regional Aspect of Daylight Sufficiency Metrics." In Removing Barriers to Environmental Comfort in the Global South. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-24208-3_17.

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Rockcastle, Siobhan, and Marilyne Andersen. "Defining New Metrics for Contrast and Variability." In Annual Dynamics of Daylight Variability and Contrast. Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5233-0_4.

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Rockcastle, Siobhan, and Marilyne Andersen. "Application of New Metrics to Abstract Spatial Models." In Annual Dynamics of Daylight Variability and Contrast. Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5233-0_5.

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Rockcastle, Siobhan, and Marilyne Andersen. "Application of New Metrics to Detailed Case Studies." In Annual Dynamics of Daylight Variability and Contrast. Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5233-0_6.

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Khelil, Alla Eddine, and Sara Khelil. "Evaluation and Optimization of Daylighting in Classroom Environments." In Proceedings in Technology Transfer. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-97-8588-9_40.

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Abstract In educational settings, the quality of lighting plays a crucial role in creating conducive learning environments. This study focuses on the evaluation and optimization of daylighting in a classroom setting, aiming to enhance the visual comfort and well-being of students and educators. The research employs a comprehensive approach, integrating quantitative method to assess the existing daylighting conditions and subsequently applying optimization techniques for improved lighting performance. The evaluation phase involves a detailed analysis of the current daylighting levels, taking in
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Sood, Neetu, Indu Saini, Tarannum Awasthi, Milin Kaur Saini, Parul Bhoriwal, and Tanveer Kaur. "Fog Removal Algorithms for Real-Time Video Footage in Smart Cities for Safe Driving." In Practice, Progress, and Proficiency in Sustainability. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-8085-0.ch003.

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In this chapter, different approaches are presented for removal of fog from video footage taken in moving cars. The methodology uses different approaches, namely dark channel prior, contrast limited adaptive histogram equalization (CLAHE), the combination of two approaches (dark channel prior and CLAHE), and RETINEX algorithm combined with DWT. The algorithms are implemented in MATLAB R2015a. Moreover, the algorithms are compared based on their computational complexity and a visibility metric which is used for computing the CNR of video frames before and after the application of the algorithm.
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Kalaimathy, Kamaraj, Chathana Thagavel, and Sofiya M. Karunanithi. "Daylight Calculation Methods for Residential Spaces in Warm-Humid Climates." In Sustainable Approaches in Spatial Design. IGI Global, 2025. https://doi.org/10.4018/979-8-3373-0174-7.ch004.

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Daylighting is valued in commercial and industrial settings but disregarded in residences. Thus, the study uses a ground-floor of a residence in Chennai, a warm, humid climate zone, to learn daylight calculating methodologies and metrics. The study assesses daylight performance using a BRE protractor, an Illuminance meter, and Design Builder simulation. Daylight Factor is used to evaluate all procedures in overcast skies. Differences in daylight factor, window-wall ratio (WWR), uniformity ratios, and Illuminance values are examined by comparing these methodologies. Variations in kitchen window
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Conference papers on the topic "Daylight metric"

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Ershov, Sergey Valentinovich, Vadim Gennadjevich Sokolov, Alexey Gennadievich Voloboy, and Vladimir Alexandrovich Galaktionov. "Effective Simulation of Spatial Daylight Autonomy and Annual Sunlight Exposure." In 32nd International Conference on Computer Graphics and Vision. Keldysh Institute of Applied Mathematics, 2022. http://dx.doi.org/10.20948/graphicon-2022-64-72.

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Nowadays the daylight analysis is widely used by architects because it influences on the room usage and comfortability. The natural daylight has a lot of benefits. There are many issues related to the daylight which affects the function and perception of the illuminated area. The issues are direct sunlight and discomfort glare, illumination level and distribution on the working plane. The correct building design that takes into account the daylight analysis aspects leads to decrease of the artificial light usage and energy saving. So simulation of the metrics used in daylight analysis is an im
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Acosta, I., M. Campano, J. Fernandez-Aguera, and P. Bustamante. "CONTINUOUS OVERCAST DAYLIGHT AUTONOMY: A NEW SENSOR-LESS ALGORITHM FOR LIGHTING SMART CONTROLS." In CIE 2023 Conference. International Commission on Illumination, CIE, 2023. http://dx.doi.org/10.25039/x50.2023.op001.

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Daylight dynamic metrics are valuable instruments for determining the activation or dimming of electric lighting systems linked to an architectural context. An updated version of these metrics can also be employed to establish strategies to adapt the luminaires to the daylight conditions, dimming the luminous flux without external devices and consequently increasing the energy saving of the lighting system. Given this scenario, a new concept is proposed, Continuous Overcast Daylight Autonomy (DAo.con), conceived as the percentage of occupied time during which an illuminance threshold is reache
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Bustamante, P., I. Acosta, A. Roldán, and M. Campano. "DAYLIGHT SPECTRUM INDEX: MEASURING THE DAYLIGHTING AFFINITY OF ELECTRIC LIGHTS." In CIE 2023 Conference. International Commission on Illumination, CIE, 2023. http://dx.doi.org/10.25039/x50.2023.po178.

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When it comes to evaluating the colour rendering of a given light source, the field of colorimetry currently encompasses a wide range of metrics that lack consensus. Over time, researchers have introduced several new metrics, including the Colour Quality Scale (CQS), due to the recognition of the limitations of the Colour Rendering Index (CRI). Building on the principles of the CRI, these new concepts explore the analysis of deviations of colour samples within a colour space and compare the results to those achieved with a reference light source that can vary depending on the Correlated Colour
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Soi, Vardan, and Shailee Goswami. "Integrated evaluation for energy and comfort quantification of windows in a residential apartment of Mumbai." In Comfort at The Extremes 2023. CEPT University Press, 2024. http://dx.doi.org/10.62744/cate.45273.1178-462-471.

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This paper aims to understand the energy and comfort performance of glazings for residential apartment in Mumbai. Firstly, an integrated workflow was developed on Ladybug tools to conduct thermal, energy and daylight simulations using a single model. Secondly, the developed workflow was deployed to simulate multi- comfort (visual &amp; thermal &amp; energy performance) for a 2 Bedroom, Hall and Kitchen (BHK) apartment as the case study. Two glazing types, clear (U-value 5.6, SHGC 0.85, VLT 0.85) and high performing (U-value 2.5, SHGC 0.27, VLT 0.34) were analysed. The results demonstrated that
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Cao, Y., K. Zhang, K. Gruner, et al. "EMULATING DAYLIGHT IN A NEONATAL INTENSIVE CARE UNIT WITH A NOVEL SPECTRALLY TUNABLE LIGHTING SYSTEM." In CIE 2023 Conference. International Commission on Illumination, CIE, 2023. http://dx.doi.org/10.25039/x50.2023.po017.

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Lighting impacts mammalian physiology through wavelength and time-of-day dependent pathways mediated by nonvisual opsins. Some of these pathways affect processes crucial to the outcomes of the neonatal intensive care unit (NICU) patient population, such as growth, metabolism, and retinal vascular development. A lighting system emulating daylight characteristics may benefit this population and facilitate future clinical studies. We introduce the use of a spectrally tuneable lighting system (Spectral Lighting) to emulate daylight within the NICU of a paediatric hospital. Six months of sunlight i
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Pinheiro, A., and C. Amorim. "DAYLIGHT REQUIREMENTS: AN OVERVIEW OF DEFINITIONS, PROGRESS AND GAPS." In CIE 2023 Conference. International Commission on Illumination, CIE, 2023. http://dx.doi.org/10.25039/x50.2023.op073.

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Daylight is fundamental in the built environment. Requirements define, describe, and measure the behavior of daylight. This article conducts a systematic literature review that aims to investigate daylight metrics and requirements in documents regarding buildings, such as standards, regulations, rating systems, guidelines, and building and urban codes to track their progress over time and the remaining gaps. The results show a lack of studies approaching daylight requirements in building and urban codes, regulations and guidelines, showing a gap between research and design practice. There is a
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Ohki, C., N. Yoshizawa, Y. Hori, et al. "EVALUATION STRUCTURE OF VISUAL ENVIRONMENT CAUSED BY WINDOWS: RELATIONSHIP BETWEEN VIEW AND DAYLIGHTING." In CIE 2023 Conference. International Commission on Illumination, CIE, 2023. http://dx.doi.org/10.25039/x50.2023.po078.

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Daylighting is crucial in creating a comfortable indoor environment. Although several metrics are available for measuring daylight sufficiency, the amount of daylight perceived by occupants does not necessarily match with these quantifiable values. Therefore, this study hypothesized that the quality of the view from windows serves as a basis for assessing both visual and lighting environments, including the psychological adequacy of daylight. The proposed hypothesis was tested and verified by developing an evaluative structure using covariance structure analysis. Our study employed data from b
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Azzahra, Iva Rofiatun Nisa, Fransisca Viviyanti, and Rizki A. Mangkuto. "Prediction of climate-based daylight metrics by simulating monthly median illuminance." In ADVANCED INDUSTRIAL TECHNOLOGY IN ENGINEERING PHYSICS. Author(s), 2019. http://dx.doi.org/10.1063/1.5095333.

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Forouzandeh, Nima, Eleonora Brembilla, Jantien Stoter, and Liangliang Nan. "Impact of geometrical resolution on long-term climate-based daylight metrics." In 2023 Building Simulation Conference. IBPSA, 2023. http://dx.doi.org/10.26868/25222708.2023.1132.

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Belgers, S., L. Schlangen, R. Cuijpers, and I. Heynderickx. "DEGRADATION OF BIOLOGICAL POTENCY IN LED LIGHT SOURCES WITH LIFETIME." In CIE 2023 Conference. International Commission on Illumination, CIE, 2023. http://dx.doi.org/10.25039/x50.2023.pp003.

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This paper investigates the degradation of biological potency in LED light sources over their lifetime. Biological potency refers to the ability of light to generate biological effects, for instance on sleep, mood, and circadian rhythms. Current lifetime metrics for LEDs typically do not consider the biological potency, despite its relevance for human health and well-being. Therefore, we investigate such metrics and explore blue light hazard changes over the lifetime of LEDs. Using a dataset of accelerated aging of LEDs, we show that the melanopic equivalent daylight luminance maintenance decr
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