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  • 1.
    Aries, Myriam
    et al.
    Department of the Built Environment, Eindhoven University of Technology, Eindhoven, Netherlands.
    Aarts, Mariëlle
    Department of the Built Environment, Eindhoven University of Technology, Eindhoven, Netherlands.
    van Hoof, Joost
    Centre for Healthcare and Technology, Fontys University of Applied Sciences, Eindhoven, Netherlands.
    Daylight and health: A review of the evidence and consequences for the built environment2015In: Lighting Research and Technology, ISSN 1477-1535, E-ISSN 1477-0938, Vol. 47, no 1, p. 16-27Article in journal (Refereed)
    Abstract [en]

    Daylight has been associated with multiple health advantages. Some of these claims are associations, hypotheses or beliefs. This review presents an overview of a scientific literature search on the proven effects of daylight exposure on human health. Studies were identified with a search strategy across two main databases. Additionally, a search was performed based on specific health effects. The results are diverse and either physiological or psychological. A rather limited statistically significant and well-documented scientific proof for the association between daylight and its potential health consequences was found. However, the search based on specific health terms made it possible to create a first subdivision of associations with daylight, leading to the first practical implementations for building design.

  • 2.
    Chraibi, S.
    et al.
    Philips Lighting B.V., Eindhoven, the Netherlands.
    Creemers, P.
    Department of the Built Environment, Building Lighting Group, Eindhoven University of Technology, Eindhoven, the Netherlands.
    Rosenkötter, C.
    Department of the Built Environment, Building Lighting Group, Eindhoven University of Technology, Eindhoven, the Netherlands.
    van Loenen, E. J.
    Department of the Built Environment, Building Lighting Group, Eindhoven University of Technology, Eindhoven, the Netherlands.
    Aries, Myriam
    Jönköping University, School of Engineering, JTH, Civil Engineering and Lighting Science.
    Rosemann, A. L. P.
    Department of the Built Environment, Building Lighting Group, Eindhoven University of Technology, Eindhoven, the Netherlands.
    Dimming strategies for open office lighting: User experience and acceptance2019In: Lighting Research and Technology, ISSN 1477-1535, E-ISSN 1477-0938, Vol. 51, no 4, p. 513-529Article in journal (Refereed)
    Abstract [en]

    Sensor-triggered control strategies can limit the energy consumption of lighting by considering the presence of users in the office and dimming lighting down when it is not needed. In multi-user offices, the application of occupancy-based dimming at room level limits the energy saving potential. However, zone- or desk-based dimming may affect the comfort of co-workers due to its dynamics. This paper reports the assessment by 17 participants (30–50 years of age) of occupancy-based dimming in a mock-up office, using different dimming speeds. Participants consisted of co-workers experiencing changes triggered by others, and actors triggering these light changes. While the participants performed an office-based task, the luminaire above the actors’ desk was dimmed from approximately 550 lx to 350 lx (average horizontal illuminance), and vice versa. The participants evaluated the dimming conditions regarding their noticeability and acceptability. The study showed that the noticeability of light changes due to dimming, increases when fading times become shorter. Dimming with a fading time of at least two seconds was experienced as acceptable by more than 70% of the participants. The results of this experiment provide insights to system behaviour that does not compromise user experience while addressing energy efficient use of electric lighting.

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  • 3.
    Mangkuto, R. A.
    et al.
    Building Physics and Services, Department of the Built Environment, Eindhoven University of Technology, Eindhoven, Netherlands.
    Aries, Myriam
    Building Physics and Services, Department of the Built Environment, Eindhoven University of Technology, Eindhoven, Netherlands.
    Loenen, E. V.
    Building Physics and Services, Department of the Built Environment, Eindhoven University of Technology, Eindhoven, Netherlands.
    Hensen, J.
    Building Physics and Services, Department of the Built Environment, Eindhoven University of Technology, Eindhoven, Netherlands.
    Simulation of virtual natural lighting solutions with a simplified view2014In: Lighting Research and Technology, ISSN 1477-1535, E-ISSN 1477-0938, Vol. 46, no 2, p. 198-218Article in journal (Refereed)
    Abstract [en]

    Daylight is limited in time and space. In situations where daylight is insufficiently available, virtual natural lighting solutions (VNLS), which are systems that artificially provide lighting and view comparable to those of real windows and skylights, can be promising. VNLS can turn currently unused floor space into space with daylight qualities. The space-gaining potential of VNLS in buildings can be predicted using computational building performance simulation. This paper describes the approach of modelling VNLS with a simplified view, using the Radiance tool to evaluate the lighting performance in a reference office. The VNLS are modelled as arrays of small light sources resembling the sky, the horizon and the ground. The simulation results show that VNLS with wide beam angles generally offer a better uniformity and a larger percentage of sufficiently lit workplane area compared to those obtained with real windows under overcast sky conditions, while the discomfort glare remains comparable to that received from real windows.

  • 4.
    Newsham, Guy R.
    et al.
    National Research Council, Institute for Research in Construction, Ottawa, Canada.
    Aries, Myriam
    National Research Council, Institute for Research in Construction, Ottawa, Canada.
    Mancini, S.
    National Research Council, Institute for Research in Construction, Ottawa, Canada.
    Faye, G.
    National Research Council, Institute for Research in Construction, Ottawa, Canada.
    Individual control of electric lighting in a daylit space2008In: Lighting Research and Technology, ISSN 1477-1535, E-ISSN 1477-0938, Vol. 40, no 1, p. 25-41Article in journal (Refereed)
    Abstract [en]

    Participants (N=40) occupied a glare-free, daylit office laboratory for 1 day, and were prompted every 30 min to use dimming control over electric lighting to choose their preferred light level. Illuminances and luminances were recorded before and after each control opportunity; luminance maps were generated using a calibrated, high-dynamic range digital camera. Although there was a wide variation in chosen light levels between individuals, results showed a significant negative correlation between prevailing desktop illuminance and change in dimmer setting. This indicates that, from the perspective of occupants, daylight does displace electric lighting. Surprisingly, we did not find any luminance-based measure that was as good a predictor of participant dimmer choice as illuminance measured on the desktop. On average, manual dimming control in this situation reduced energy use for lighting by 25% compared to a fixed system delivering 500lx of electric lighting on the desktop.

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