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Optimisation of visual and beyond-visual light effects: A simulation-based process exploring workflows, metrics, and evaluation criteria
Jönköping University, School of Engineering, JTH, Construction Engineering and Lighting Science.ORCID iD: 0000-0001-6523-579X
2025 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis explores the integration of visual and beyond-visual light effects in an optimisation process to balance human well-being with other building performance aspects. It examines the challenges and opportunities of incorporating beyond-vision effects into performance metrics, simulation workflows, and evaluation criteria. Through a scoping review, five optimisation levels (M1-M5) are presented, highlighting their approaches to handling conflicting design criteria.

Key findings show that the M5: multi-objective optimisation (MOO) level offers a structured framework to explore multiple design variables and criteria simultaneously, helping identify conflicts and trade-offs, and leading to Pareto-optimal solutions. However, there is a lack of studies that integrate beyond-vision effects with other building performance and human well-being aspects in the MOO process.

To address this gap, a simulation-based optimisation process was developed, demonstrating the conceptual integration of the evaluation criteria and the methodological integration of luminous and temporal light factors. This process unfolds in three stages to meet integrative lighting needs while also assessing energy consumption. The paper found that including beyond-vision effects in the evaluation process of multiple criteria introduces significant complexity, not because of individual factors but due to the interplay between luminous and temporal aspects. This underscored the importance of lighting design that integrates these factors to balance visual and beyond-vision outcomes by ensuring the appropriate daylight and electric lighting levels, spectrum, and directionality at the right time of day.

The research contributes to understanding the complexity of beyond-vision effects trade-offs between short-term performance and long-term health, and the integration of advanced optimisation techniques. Moving forward, a shift toward systematic, staged, dynamic, and simultaneous optimisation processes will be necessary to create truly optimised, human-centred lighting environments.

Abstract [sv]

Denna avhandling undersöker integrationen av visuella och icke-visuella ljuseffekter i en optimeringsprocess för att balansera mänskligt välbefinnande med andra byggnadsprestandaaspekter. Den behandlar de utmaningar och möjligheter som följer med att införliva icke-visuella effekter i prestationsmått, simuleringsarbetsflöden och utvärderingskriterier. Genom en översikt av aktuell litteratur presenteras fem optimeringsnivåer (M1-M5), som belyser deras sätt att hantera konfliktfyllda designkriterier.

Nyckelfynden visar att M5: multi-objektiv optimering (MOO) erbjuder en strukturerad ram för att utforska flera designvariabler och kriterier samtidigt, vilket hjälper till att identifiera konflikter och avvägningar samt leder till Pareto-optimala lösningar. Dock saknas det studier som integrerar icke-visuella effekter med andra byggnadsprestanda och mänskligt välbefinnande i MOO-processen.

För att adressera denna brist utvecklades en simuleringsbaserad optimeringsprocess, som visar den konceptuella integrationen av utvärderingskriterier och den metodologiska integrationen av luminösa och temporala ljusfaktorer. Processen utspelar sig i tre stadier för att möta integrerade belysningsbehov samtidigt som energiförbrukning beaktas. Studien visade att inkludering av icke-visuella effekter i utvärderingen av flera kriterier introducerar betydande komplexitet, inte för att de individuella faktorerna är svåra utan för att de samverkar på ett komplext sätt mellan luminösa och temporala aspekter. Detta betonar vikten av belysningsdesign som integrerar dessa faktorer för att balansera visuella och icke-visuella resultat genom att säkerställa lämpliga dagsljus- och elektriska belysningsnivåer, spektrum och riktning vid rätt tid på dygnet.

Forskningen bidrar till att förstå komplexiteten i icke-visuella effekters avvägningar mellan kortsiktig prestanda och långsiktig hälsa samt integrationen av avancerade optimeringstekniker. Framöver krävs ett skifte mot systematiska, dynamiska och samtidiga optimeringsprocesser för att skapa verkligt optimerade, människocentrerade belysningsmiljöer.

Place, publisher, year, edition, pages
Jönköping: Jönköping University, School of Engineering , 2025. , p. 93
Series
JTH Dissertation Series ; 094
National Category
Architectural Engineering Building Technologies
Identifiers
URN: urn:nbn:se:hj:diva-67769ISBN: 978-91-89785-21-2 (print)ISBN: 978-91-89785-22-9 (electronic)OAI: oai:DiVA.org:hj-67769DiVA, id: diva2:1958659
Presentation
2025-05-19, E1405 (Gjuterisalen), Tekniska Högskolan, Jönköping University, Jönköping, 09:00 (English)
Opponent
Supervisors
Available from: 2025-05-16 Created: 2025-05-16 Last updated: 2025-10-13Bibliographically approved
List of papers
1. Simulation workflows in multi-objective lighting design optimisation for human well-being and building performance metrics: a scoping review
Open this publication in new window or tab >>Simulation workflows in multi-objective lighting design optimisation for human well-being and building performance metrics: a scoping review
2023 (English)In: Journal of Physics: Conference Series, Volume 2600, Daylighting & electric lighting, Institute of Physics (IOP), 2023, Vol. 2600, no 11, article id 112013Conference paper, Published paper (Refereed)
Abstract [en]

Lighting in the built environment has effects on different aspects, ranging from building performance in terms of costs and energy consumption to human well-being in terms of thermal comfort, visual effects, and beyond-vision effects. Buildings optimised for specific performance metrics rarely consider performance aspects simultaneously, leading to sub-optimised, unbalanced, or non-trade-off solutions. Therefore, multi-objective optimisation has been more commonly used to overcome conflicting performance objectives. Recently, metrics to quantify light effects beyond vision became available, but it is unclear if and how they are integrated with other existing building performance metrics. A scoping review investigated the state-of-art in multi-objective lighting design optimisation regarding building performance and human well-being focusing on performance metrics, simulation workflows, and the overall information flow. The search in Scopus and Web of Science databases resulted in 89 journal articles and conference papers, and the 21 papers reaching the highest optimisation level were discussed. The information extracted was categorised into optimisation metrics, levels, and design variables. The results show that none of the papers combines visual and beyond-vison effects with other building performance metrics.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2023
Series
Journal of Physics: Conference Series, ISSN 1742-6588, E-ISSN 1742-6596 ; 2600
National Category
Architectural Engineering Building Technologies
Identifiers
urn:nbn:se:hj:diva-63005 (URN)10.1088/1742-6596/2600/11/112013 (DOI)2-s2.0-85180151874 (Scopus ID)
Conference
CISBAT International Conference, 13-15 September, 2023, Lausanne, Switzerland
Funder
Swedish Energy Agency, P45185
Available from: 2023-12-06 Created: 2023-12-06 Last updated: 2025-10-13Bibliographically approved
2. Exploring Simulation Workflows, Tools, and Metrics for Beyond-Vision Effects in Multi-Objective Optimization: A Scoping Review
Open this publication in new window or tab >>Exploring Simulation Workflows, Tools, and Metrics for Beyond-Vision Effects in Multi-Objective Optimization: A Scoping Review
2024 (English)In: IOP Conference Series: Earth and Environmental Science, Institute of Physics Publishing (IOPP), 2024, Vol. 1320, no 1, article id 012009Conference paper, Published paper (Refereed)
Abstract [en]

Lighting in the built environment affects different aspects, ranging from building performance in terms of costs and energy consumption to human well-being in terms of thermal comfort, visual effects, and beyond-vision effects. Buildings optimised for specific performance metrics rarely consider different aspects simultaneously, leading to sub-optimised, unbalanced, or non-trade-off solutions. Therefore, multi-objective optimisation has commonly been used to overcome conflicting performance objectives. Recently, light effects beyond vision gained more interest in building design but it is unclear if and how they are integrated with other existing building performance metrics and simulation workflows. A scoping review investigated the state-of-art in multi-objective lighting design optimisation regarding building performance and human well-being focusing on performance metrics, simulation workflows, and the overall information flow. Results show that metrics for beyond-vision effects are not integrated with other human well-being and building performance metrics. The simulation workflows included multiple steps and computational tools in multi-objective optimisation. This process has limitations such as a long simulation time, no ubiquitous integrated tool, and a reduced information flow.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2024
Series
IOP Conference Series: Earth and Environmental Science (EES), E-ISSN 1755-1315 ; 1320
National Category
Building Technologies
Identifiers
urn:nbn:se:hj:diva-63973 (URN)10.1088/1755-1315/1320/1/012009 (DOI)2-s2.0-85190471222 (Scopus ID)
Conference
Light Symposium 2023: Architecture Lighting Environments - Space With(Out) Light, 4th-6th December 2023, Stockholm, Sweden
Available from: 2024-04-11 Created: 2024-04-11 Last updated: 2025-10-13Bibliographically approved
3. Evaluating visual and beyond-vision light effects and energy consumption for luminous and temporal light factors: A single office case
Open this publication in new window or tab >>Evaluating visual and beyond-vision light effects and energy consumption for luminous and temporal light factors: A single office case
2025 (English)In: Journal of Daylighting, E-ISSN 2383-8701, Vol. 12, no 2, p. 306-342Article in journal (Refereed) Published
Abstract [en]

Light influences human physiology and psychology through visual and beyond-visual effects, collectively termed ‘integrative lighting.’ Human responses depend on luminous (quantity, spectrum, directionality) and temporal (timing, duration, history) factors, yet no studies examined their combined influence on integrative lighting. Therefore, this study evaluates representative metrics integration by designing, implementing, and testing a comprehensive lighting simulation framework incorporating luminous and temporal factors to address integrative lighting needs while assessing energy consumption. A quantitative approach was employed, integrating multiple criteria through computational simulations using Rhinoceros/Grasshopper, Lark, ClimateStudio, and Ladybug/Honeybee. Simulations are performed in a single office with nine control points, four vertical viewing directions, and one horizontal, each testing eight window sizes and different electric lighting combinations of ceiling panels and wall-washers with varying melanopic-content across four seasonal days. Including beyond-visual effects in multi-criteria optimisation introduces complexity due to the interplay between luminous and temporal aspects. Results show that beyond-visual effects depend on light quantity, spectral composition, and spatial distribution. Increasing window-to-wall ratio or melanopic-content lighting alone does not ensure uniform beyond-visual performance. Instead, directing wall washers at opaque surfaces enhances background luminance, reduces glare, and improves retinal exposure. Beyond-vision criteria are challenging due to temporal dependencies, often requiring window size and lighting energy use trade-offs. These findings highlight the need for lighting designs that optimise light levels, spectrum, and directionality at the right time. Future approaches should use multi-objective optimisation to balance visual and non-visual outcomes, automate adjustments, and enhance well-being while maintaining energy efficiency.

Place, publisher, year, edition, pages
SolarLits, 2025
Keywords
visual light effects, beyond-vision light effects, window-to-wall ratio, daylight
National Category
Architectural Engineering Building Technologies
Identifiers
urn:nbn:se:hj:diva-67768 (URN)10.15627/jd.2025.21 (DOI)001580748800003 ()2-s2.0-105014257209 (Scopus ID)POA;;67768 (Local ID)POA;;67768 (Archive number)POA;;67768 (OAI)
Funder
Bertil & Britt Svenssons Stiftelse för Belysningsteknik, 2022-vår-07
Note

Included in the licentiate thesis in its accepted version.

Available from: 2025-05-16 Created: 2025-05-16 Last updated: 2025-10-13Bibliographically approved

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