Effects of dynamic lighting on office workers: First results of a field study with monthly alternating settings

Kort, Y.; Smolders, Kchj Karin

doi:10.1177/1477153510378150

Cited by 107 publications

(94 citation statements)

References 27 publications

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“…Although Likert scales are usually considered to be ordinal, the use of 11-point Likert scales, specifically from 0 to 10 and including a middle point, have been recommended to be used to approximate to interval scales (Wu and Leung 2017). As a result, in this analysis we employ LMM, which has been previously used to analyze ordinal data in lighting research (de Kort and Smolders 2010;Smolders et al 2012).…”

Section: Analysis Strategymentioning

confidence: 99%

Window Size Effects on Subjective Impressions of Daylit Spaces: Indoor Studies at High Latitudes Using Virtual Reality

Moscoso

Chamilothori

Wienold

et al. 2020

LEUKOS

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Daylight provision to the indoor space is affected by different building elements that cannot be fully controlled by the users, such as the window size of a space. The dimensions of the fenestration not only affect the lighting levels, but they also affect how the space is perceived by its users. The present study examines three different window sizes via virtual reality, to study how they affect the perception of both a small and a large space at high latitudes. Additionally, two context scenarios (socializing and working), as well as three different sky types (overcast sky and clear skies with either high or low sun angle) were evaluated. The experimental study applied a mixed design with within-subjects and between-subjects factors. A total of 150 participants evaluated the scenes using a Likert-type scale to rate eight different subjective attributes. The statistical results showed that both window size and space type significantly affect the participants' spatial perception, as well as their satisfaction with the amount of outside view. Larger windows led to more positively evaluated spaces for all studied attributes. Moreover, a significant interaction was found between window size and type of space for the satisfaction with the amount of view in the space, indicating that the window size was dependent on the type of space in which the windows are located. Specifically, the window sizes were rated higher in the small space than in the large space for the evaluation of amount of view. The findings show that window size affects how people perceive a space, and additionally, that other spatial features, such as space type, affect window size preferences.

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Section: Analysis Strategymentioning

confidence: 99%

Window Size Effects on Subjective Impressions of Daylit Spaces: Indoor Studies at High Latitudes Using Virtual Reality

Moscoso

Chamilothori

Wienold

et al. 2020

LEUKOS

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show abstract

“…The data provided information about the physiological behaviour of humans in a particular light environ- a dynamic light scenario [53] .…”

Section: Discussionmentioning

confidence: 99%

Physiological Effects of Blue Pulsed LED in an Indoor Lighting Environment

Chaveznava-Treviño

Katsuura

Shimomura

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Purpose: An experiment was conducted to investigate the physiological effects of a continuous blue pulsed light emitting diode (BP-LED) added to a task lamp in an actual indoor lighting environment and its influence in alertness having as a final purpose to develop a commercial product that could be applied in situations similar to those depicted in the present work. Design methodology: Previous research studies have stated that the addition of pulsed light evokes physiological changes that may induce alertness. The participants were exposed to four different lighting conditions. Electroencephalograms (EEG), pupil sizes, heart rates (HR), performance tests, and subjective reactions were measured. Findings: Low colour temperature light and the BP-LED revealed an improved alertness according to the data from the EEG recordings. The intervention of the BP-LED in a high colour temperature ambiance was beneficial in maintaining high levels of alertness compared to the conditions where the BP-LED was not used. It was tested that the use of a BP-LED in a task lamp may be beneficial in improving or maintaining alertness levels in an indoor workplace ambiance. Originality and Value: Designing of an adequate workplace task lamp light that improves alertness for in-house, office, or classroom situations in which it is essential.

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“…In a study comparing dynamic light with static light for office workers illuminance was changed between 500 and 700 lux and the CCT between 3000 and 4700 K. No positive effects on sleep, vitality, headaches and productivity of dynamic light were found. However, the employees were subjectively more satisfied with the dynamic light than with the static light 32 . To date, non-visual light effects were predominantly studied during the evening or at night, and to a lesser extent during the day with inconclusive findings.…”

Section: Introductionmentioning

confidence: 88%

Changing color and intensity of LED lighting across the day impacts on human circadian physiology, sleep, visual comfort and cognitive performance

Stefani

Freyburger

Veitz

et al. 2020

Preprint

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We examined whether dynamic light across a scheduled 16-h waking day influences cognitive performance, visual comfort, melatonin secretion, sleepiness and sleep under strictly controlled laboratory conditions of 49-h duration.Participants spent the first 5-h in the evening under standard lighting, followed by an 8-h nocturnal sleep episode at habitual bedtimes. Thereafter volunteers either woke up with static daylight LED (100 lux and 4000 Kelvin) or with a dynamic daylight LED that changed color (2700 -5000 Kelvin) and intensity (0 -100 lux) across the scheduled 16-h waking day. This was followed by an 8-h nocturnal treatment sleep episode at habitual bedtimes. Thereafter, volunteers spent another 12-h either under static or dynamic light during scheduled wakefulness.Under dynamic light, evening melatonin levels were less suppressed 1.5hours prior to usual bedtime, and participants felt less vigilant in the evening compared to static light. Sleep latency was significantly shorter in both the baseline and treatment night compared to the static light condition while sleep structure, sleep quality, cognitive performance and visual comfort did not significantly change. Our results support the recommendation of using blue-depleted light and low illuminances in the late evening, which can be achieved by a dynamically changing daylight LED solution.

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Effects of dynamic lighting on office workers: First results of a field study with monthly alternating settings

Cited by 107 publications

References 27 publications

Window Size Effects on Subjective Impressions of Daylit Spaces: Indoor Studies at High Latitudes Using Virtual Reality

Window Size Effects on Subjective Impressions of Daylit Spaces: Indoor Studies at High Latitudes Using Virtual Reality

Physiological Effects of Blue Pulsed LED in an Indoor Lighting Environment

Changing color and intensity of LED lighting across the day impacts on human circadian physiology, sleep, visual comfort and cognitive performance

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