Abstract

The objective of this paper is to investigate how daylight dynamics can act as a point of inspiration for developing a lighting design concept for work environments such as open space offices. Most often the dynamics of light in lighting design strategies are limited to the aspects of intensity (lx level) and colour of light (CCT). However, mimicking the natural variation of diffuse and direct light may also be important, since people have a general preference and a profound relation to the dynamics of daylight, given that perception and vision have evolved underneath changing sky conditions.
Based on this hypothesis, a research approach has been defined, investigating the relationship between the light distribution and light modelling qualities of daylight and how these qualities can be complimented by electrical lighting.
Four representative sky types have been studied to investigate the range of the light modelling qualities found in daylight. The ratio between diffuse to direct daylight has been examined through simulations and analysis of digital photographic images. Test were then carried out exploring how the three-dimensional light modelling effects of these four daylight conditions can best be reproduced with electrical lighting sources in a lighting laboratory.
The studies suggested that the desired light modelling qualities are appearing, when the ratio between direct and diffuse light sources is above 13% and below 52% of the total amount of light. This initial finding indicates that daylight modelling qualities can be recreated in office environments with standard diffuse ceiling lighting by adding only 13% direct light on the work plane. The direct light must, however, have similar directionality as the daylight inflow through windows, to reinforce an experience of flow of light. The upper and lower perceptual boundaries of the diffuse to direct light ratio will be investigated further in relation to the dynamics of interior daylight illumiation patterns.
The qualities of daylight such as light modelling and the flow of light can thus be adapted into electrical lighting to develop strategies for double dynamic lighting, with the aim of creating stimulating work environments with more natural lighting variations.
Original languageEnglish
Title of host publicationARCH19: BUILDING FOR BETTER HEALTH : Research & innovation in architecture & urban design for care & health
PublisherPolyteknisk Boghandel og Forlag
Publication dateJun 2019
Publication statusPublished - Jun 2019
EventARCH19: Building for better health: Research & innovation in architecture & urban design for care & health - Kunnskapssenteret St. Olavs hospital, Trondheim, Norway
Duration: 12 Jun 201914 Jun 2019
https://www.ntnu.edu/web/arch19/program

Conference

ConferenceARCH19: Building for better health
LocationKunnskapssenteret St. Olavs hospital
CountryNorway
CityTrondheim
Period12/06/201914/06/2019
Internet address

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Hansen, E. K., & Mathiasen, N. (2019). Dynamic lighting balancing diffuse and direct light. In ARCH19: BUILDING FOR BETTER HEALTH : Research & innovation in architecture & urban design for care & health Polyteknisk Boghandel og Forlag.
Hansen, Ellen Kathrine ; Mathiasen, Nanet. / Dynamic lighting balancing diffuse and direct light. ARCH19: BUILDING FOR BETTER HEALTH : Research & innovation in architecture & urban design for care & health. Polyteknisk Boghandel og Forlag, 2019.
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abstract = "The objective of this paper is to investigate how daylight dynamics can act as a point of inspiration for developing a lighting design concept for work environments such as open space offices. Most often the dynamics of light in lighting design strategies are limited to the aspects of intensity (lx level) and colour of light (CCT). However, mimicking the natural variation of diffuse and direct light may also be important, since people have a general preference and a profound relation to the dynamics of daylight, given that perception and vision have evolved underneath changing sky conditions. Based on this hypothesis, a research approach has been defined, investigating the relationship between the light distribution and light modelling qualities of daylight and how these qualities can be complimented by electrical lighting. Four representative sky types have been studied to investigate the range of the light modelling qualities found in daylight. The ratio between diffuse to direct daylight has been examined through simulations and analysis of digital photographic images. Test were then carried out exploring how the three-dimensional light modelling effects of these four daylight conditions can best be reproduced with electrical lighting sources in a lighting laboratory. The studies suggested that the desired light modelling qualities are appearing, when the ratio between direct and diffuse light sources is above 13{\%} and below 52{\%} of the total amount of light. This initial finding indicates that daylight modelling qualities can be recreated in office environments with standard diffuse ceiling lighting by adding only 13{\%} direct light on the work plane. The direct light must, however, have similar directionality as the daylight inflow through windows, to reinforce an experience of flow of light. The upper and lower perceptual boundaries of the diffuse to direct light ratio will be investigated further in relation to the dynamics of interior daylight illumiation patterns.The qualities of daylight such as light modelling and the flow of light can thus be adapted into electrical lighting to develop strategies for double dynamic lighting, with the aim of creating stimulating work environments with more natural lighting variations.",
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Hansen, EK & Mathiasen, N 2019, Dynamic lighting balancing diffuse and direct light. in ARCH19: BUILDING FOR BETTER HEALTH : Research & innovation in architecture & urban design for care & health. Polyteknisk Boghandel og Forlag, ARCH19: Building for better health, Trondheim, Norway, 12/06/2019.

Dynamic lighting balancing diffuse and direct light. / Hansen, Ellen Kathrine; Mathiasen, Nanet.

ARCH19: BUILDING FOR BETTER HEALTH : Research & innovation in architecture & urban design for care & health. Polyteknisk Boghandel og Forlag, 2019.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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N2 - The objective of this paper is to investigate how daylight dynamics can act as a point of inspiration for developing a lighting design concept for work environments such as open space offices. Most often the dynamics of light in lighting design strategies are limited to the aspects of intensity (lx level) and colour of light (CCT). However, mimicking the natural variation of diffuse and direct light may also be important, since people have a general preference and a profound relation to the dynamics of daylight, given that perception and vision have evolved underneath changing sky conditions. Based on this hypothesis, a research approach has been defined, investigating the relationship between the light distribution and light modelling qualities of daylight and how these qualities can be complimented by electrical lighting. Four representative sky types have been studied to investigate the range of the light modelling qualities found in daylight. The ratio between diffuse to direct daylight has been examined through simulations and analysis of digital photographic images. Test were then carried out exploring how the three-dimensional light modelling effects of these four daylight conditions can best be reproduced with electrical lighting sources in a lighting laboratory. The studies suggested that the desired light modelling qualities are appearing, when the ratio between direct and diffuse light sources is above 13% and below 52% of the total amount of light. This initial finding indicates that daylight modelling qualities can be recreated in office environments with standard diffuse ceiling lighting by adding only 13% direct light on the work plane. The direct light must, however, have similar directionality as the daylight inflow through windows, to reinforce an experience of flow of light. The upper and lower perceptual boundaries of the diffuse to direct light ratio will be investigated further in relation to the dynamics of interior daylight illumiation patterns.The qualities of daylight such as light modelling and the flow of light can thus be adapted into electrical lighting to develop strategies for double dynamic lighting, with the aim of creating stimulating work environments with more natural lighting variations.

AB - The objective of this paper is to investigate how daylight dynamics can act as a point of inspiration for developing a lighting design concept for work environments such as open space offices. Most often the dynamics of light in lighting design strategies are limited to the aspects of intensity (lx level) and colour of light (CCT). However, mimicking the natural variation of diffuse and direct light may also be important, since people have a general preference and a profound relation to the dynamics of daylight, given that perception and vision have evolved underneath changing sky conditions. Based on this hypothesis, a research approach has been defined, investigating the relationship between the light distribution and light modelling qualities of daylight and how these qualities can be complimented by electrical lighting. Four representative sky types have been studied to investigate the range of the light modelling qualities found in daylight. The ratio between diffuse to direct daylight has been examined through simulations and analysis of digital photographic images. Test were then carried out exploring how the three-dimensional light modelling effects of these four daylight conditions can best be reproduced with electrical lighting sources in a lighting laboratory. The studies suggested that the desired light modelling qualities are appearing, when the ratio between direct and diffuse light sources is above 13% and below 52% of the total amount of light. This initial finding indicates that daylight modelling qualities can be recreated in office environments with standard diffuse ceiling lighting by adding only 13% direct light on the work plane. The direct light must, however, have similar directionality as the daylight inflow through windows, to reinforce an experience of flow of light. The upper and lower perceptual boundaries of the diffuse to direct light ratio will be investigated further in relation to the dynamics of interior daylight illumiation patterns.The qualities of daylight such as light modelling and the flow of light can thus be adapted into electrical lighting to develop strategies for double dynamic lighting, with the aim of creating stimulating work environments with more natural lighting variations.

M3 - Article in proceeding

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ER -

Hansen EK, Mathiasen N. Dynamic lighting balancing diffuse and direct light. In ARCH19: BUILDING FOR BETTER HEALTH : Research & innovation in architecture & urban design for care & health. Polyteknisk Boghandel og Forlag. 2019