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Study of the Effects of Daylighting and Artificial Lighting at 59° Latitude on Mental States, Behaviour and Perception
KTH, School of Architecture and the Built Environment (ABE), Architecture, Lighting Design.ORCID iD: 0000-0003-2562-2108
Stress Research Institute at the Department of Psychology, Stockholm University.ORCID iD: 0000-0002-6980-2971
KTH, School of Electrical Engineering and Computer Science (EECS), Human Centered Technology, Media Technology and Interaction Design, MID.ORCID iD: 0000-0002-3086-0322
KTH, School of Electrical Engineering and Computer Science (EECS), Human Centered Technology, Media Technology and Interaction Design, MID.
2023 (English)In: Sustainability, E-ISSN 2071-1050, Vol. 15, no 2, article id 1144Article in journal (Refereed) Published
Abstract [en]

Although there is a documented preference for daylighting over artificial electric lighting indoors, there are comparatively few investigations of behaviour and perception in indoor day-lit spaces at high latitudes during winter. We report a pilot study designed to examine the effects of static artificial lighting conditions (ALC) and dynamic daylighting conditions (DLC) on the behaviour and perception of two groups of participants. Each group (n = 9 for ALC and n = 8 for DLC) experienced one of the two conditions for three consecutive days, from sunrise to sunset. The main results of this study show the following: indoor light exposure in February in Stockholm can be maintained over 1000 lx only with daylight for most of the working day, a value similar to outdoor workers’ exposure in Scandinavia; these values can be over the recommended Melanopic Equivalent Daylight Illuminance threshold; and this exposure reduces sleepiness and increases amount of activity compared to a static artificial lighting condition. Mood and feeling of time passing are also affected, but we do not exactly know by which variable, either personal or group dynamics, view or variation of the lighting exposure. The small sample size does not support inferential statistics; however, these significant effects might be large enough to be of importance in practice. From a sustainability point of view, daylighting can benefit energy saving strategies and well-being, even in the Scandinavian winter.

Place, publisher, year, edition, pages
MDPI AG , 2023. Vol. 15, no 2, article id 1144
Keywords [en]
lighting design, perception of light, temporal perception, multidisciplinary approach, Scandinavian winter, sustainable environments
National Category
Architecture Design Applied Psychology
Research subject
Architecture; Art, Technology and Design; Technology and Health
Identifiers
URN: urn:nbn:se:kth:diva-344943DOI: 10.3390/su15021144ISI: 000916129300001Scopus ID: 2-s2.0-85146697019OAI: oai:DiVA.org:kth-344943DiVA, id: diva2:1848601
Funder
Bertil & Britt Svenssons Stiftelse för Belysningsteknik
Note

QC 20240405

Available from: 2024-04-04 Created: 2024-04-04 Last updated: 2024-05-22Bibliographically approved
In thesis
1. Light Rhythms: Exploring the Perceptual and Behavioural Effects of Daylight and Artificial Light Conditions in a Scandinavian Context
Open this publication in new window or tab >>Light Rhythms: Exploring the Perceptual and Behavioural Effects of Daylight and Artificial Light Conditions in a Scandinavian Context
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This compilation thesis collects multidisciplinary work on the study of the impact of light rhythms on perception and behaviour. The thesis was structured to answer and discuss the questions: “How does a person feel and behave inan illuminated space?” and “Do variable light conditions influence perception, appraisal and motion?”. In order to answer the questions, I applied methods from design, psychology and behavioural science, conducted literature reviews and performed two experimental studies. In response to the first question, the outcome of the five papers included in the thesis show that light and lighting rhythms elicit specific acute and long-term effects. These effects impact on these categories of aspects: visual and perceptual, appraisal and experience, behavioural and physiological. To structure and visualize these diverse aspects, I introduce the CLAPP framework: Context Light(ing) Action (behaviour), Perception, Person. The framework highlights the complex interplay between light, environment, and human response, by displaying features related to spatial and light rhythms, effects of light on mind and body, and personal features. The framework can provide structure and direction for education and research activities within the scope of Architectural Lighting Design. In response to the second research question, results from the experimental studies reveal that, even after eliminating view and sunlight, variable daylight conditions elicit better mood, higher pleasure, and influence motion, compared to artificial light conditions. The results of this thesis may contribute to achieving the UN sustainability goals, specifically to improve the well-being of the population (SDG3), to design a built-environment that is safe and resilient (SDG 11), and to promote the uses of affordable and clean energy (SDG 7). Building on the experience gained during this thesis work, I am confident that multidisciplinary collaboration will enable to integrate the diverse aspects included in the CLAPP framework, paving the way for the design of spaces that are both resilient and supportive of health.

Abstract [sv]

Denna sammanläggningsavhandling samlar tvärvetenskapligt arbete om studien av ljusrytmers inverkan på perception och beteende. Avhandlingen var strukturerad för att besvara och diskutera frågorna: “Hur känner och beter sig en person i ett upplyst rum?” och “Påverkar varierande ljusförhållanden perception, bedömning och rörelse?”. För att besvara frågorna använde jag metoder från design, psykologi och beteendevetenskap, och genomförde litteraturstudier och två experimentella studier. Som svar på den första frågan visar resultaten från de fem artiklar som ingår i avhandlingen att ljus och ljusrytmer framkallar specifika direkta och långsiktiga effekter. Dessa effekter påverkar följande kategorier av aspekter: visuella och perceptuella, bedömning och upplevelse, beteendemässiga och fysiologiska. För att strukturera och visualisera dessa olika aspekter introducerar jag ramverket CLAPP: Context Light(ing) Action (behaviour), Per-ception, Person. Ramverket belyser det komplexa samspelet mellan ljus, miljö och mänsklig respons genom att visa funktioner relaterade till rums- och ljusrytmer, effekter av ljus på sinne och kropp samt personliga egenskaper. Ramverketkan ge struktur och riktning för utbildnings- och forskningsaktiviteter inom området Architectural Lighting Design. Som svar på den andra forskningsfrågan visar resultaten från de experimentella studierna att varierande dagsljusförhållanden framkallar bättre humör och glädje, och påverkar rörelse, jämfört med artificiella ljusförhållanden, även efter att utsikt och solljus eliminerats. Resultaten av denna avhandling kan bidra till att uppnå FN:s hållbarhetsmål, särskiltatt förbättra befolkningens välbefinnande (SDG 3), att utforma en byggd miljösom är säker och motståndskraftig (SDG 11), och stödjar användningen av över-komlig och ren energi (SDG 7). Med utgångspunkt i erfarenheterna från detta examensarbete är jag övertygad om att tvärvetenskapligt samarbete kommer att göra det möjligt att integrera de olika aspekter som ingår i CLAPP-ramverket,vilket banar väg för utformningen av utrymmen som är både motståndskraftiga och stödjande för hälsa.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2024. p. 65
Series
TRITA-EECS-AVL ; 2024:32
Keywords
Lighting design, Context, Light, Behaviour, Perception of light, Perception of time, Associative aspects, Architecture, Daylight
National Category
Design Architecture Media and Communication Technology
Research subject
Media Technology
Identifiers
urn:nbn:se:kth:diva-344946 (URN)978-91-8040-884-4 (ISBN)
Public defence
2024-04-29, https://kth-se.zoom.us/j/68660447128, Kollegiesalen, Brinellvägen 8, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
Bertil & Britt Svenssons Stiftelse för Belysningsteknik
Note

QC 20240405

Available from: 2024-04-05 Created: 2024-04-04 Last updated: 2024-04-15Bibliographically approved

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Favero, FedericoBresin, RobertoEjhed, Jan

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