Assessment protocol and effects of two dynamic light patterns on human well-being and performance in a simulated and operational office environment

Aries, Mbc Myriam; Beute, Femke; Fischl, Géza

doi:10.1016/j.jenvp.2020.101409

Cited by 24 publications

(16 citation statements)

References 57 publications

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“…Fig 4A clearly shows that the bright light was evaluated as more comfortable than the dim light by some participants, but less comfortable by others. In contrast, the effect of CCT on ComfortV showed no statistically significant interindividual differences in responsiveness (χ 2 (2) = .26, p=.88). Fig 4B indicates that the difference in CCT of the light conditions led to comparable changes in visual comfort evaluations for all participants; the warm light conditions were, on average, experienced as more comfortable (1.27 ± .10) compared to the cool light conditions (.92 ± .10).…”

Section: Resultsmentioning

confidence: 79%

“…For visual comfort, there was a statistically significant main effect of CCT (Fig 3D; F(1,44) = 13.42, p=.001), but not of Illuminance . However, the effect of Illuminance on Comfort V was structurally influenced by interindividual differences (χ 2 (2) = 18.82, p<.001); the illuminance of the light led to widely varying visual comfort votes by the participants (range = - .50 to 1.57). Fig 4A clearly shows that the bright light was evaluated as more comfortable than the dim light by some participants, but less comfortable by others.…”

Section: Resultsmentioning

confidence: 98%

“…Light that is dynamic in illuminance and correlated color temperature (CCT) may induce ipRGC-influenced light responses (IIL; also known as non-image forming or non-visual effects) resulting in improved health, well-being and productivity of office workers (1). Several studies have investigated effects of such dynamic scenarios and hint towards positive effects on human functioning (e.g., [2][3][4]. However, the lack of consolidated research methods prevents the formulation of a clear-cut conclusion (5).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Abrupt light transitions in illuminance and CCT result in different temporal dynamics and interindividual variability for sensation, comfort and alertness

Kompier

Smolders

Kort

2020

Preprint

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Detailed insights in both visual effects of light and effects beyond vision due to manipulations in illuminance and correlated color temperature (CCT) are needed to optimize study protocols as well as to design light scenarios for practical applications. This study investigated temporal dynamics and interindividual variability in subjective evaluations of sensation, comfort and mood as well as subjective and objective measures of alertness, arousal and thermoregulation following abrupt transitions in illuminance and CCT in a mild cold environment. The effects could be uniquely attributed to changes in illuminance or CCT and no interaction effects of illuminance and CCT were found for any of these markers. Responses to the abrupt transitions in illuminance and CCT always occurred immediately and exclusively amongst the subjective measures. Most of these responses diminished over time within the 45-minute light manipulation. In this period, no responses were found for objective measures of vigilance, arousal nor thermoregulation. Significant interindividual variability occurred only in the visual comfort evaluation in response to changes in the intensity of the light. The results indicate that the design of dynamic light scenarios aimed to enhance human alertness and vitality requires tailoring to the individual to create visually comfortable environments.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Abrupt light transitions in illuminance and CCT result in different temporal dynamics and interindividual variability for sensation, comfort and alertness

Kompier

Smolders

Kort

2020

Preprint

View full text Add to dashboard Cite

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“…In addition to the aspect of energy saving, ergonomic considerations in lighting are becoming increasingly important. Modern, multi-channel LED systems offer a huge flexibility in providing dynamic patterns of light exposure throughout the day [ 20 ], which can be tailored to match the users’ specific needs in terms of circadian rhythm [ 21 , 22 , 23 ], task-related performance [ 20 , 24 , 25 ], and lighting preference [ 26 , 27 , 28 , 29 ]. With regard to an intelligent lighting control, sensor feedback may thus allow for an automated time- and task-dependent adaptation of corresponding light levels and spectra, while taking contributions from time-varying natural daylight sources into account.…”

Section: Introductionmentioning

confidence: 99%

Tackling Heterogeneous Color Registration: Binning Color Sensors

Myland

Babilon

Khanh

2021

Sensors

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Intelligent systems for interior lighting strive to balance economical, ecological, and health-related needs. For this purpose, they rely on sensors to assess and respond to the current room conditions. With an augmented demand for more dedicated control, the number of sensors used in parallel increases considerably. In this context, the present work focuses on optical sensors with three spectral channels used to capture color-related information of the illumination conditions such as their chromaticities and correlated color temperatures. One major drawback of these devices, in particular with regard to intelligent lighting control, is that even same-type color sensors show production related differences in their color registration. Standard methods for color correction are either impractical for large-scale production or they result in large colorimetric errors. Therefore, this article shows the feasibility of a novel sensor binning approach using the sensor responses to a single white light source for cluster assignment. A cluster specific color correction is shown to significantly reduce the registered color differences for a selection of test stimuli to values in the range of 0.003–0.008 Δu′v′, which enables the wide use of such sensors in practice and, at the same time, requires minimal additional effort in sensor commissioning.

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“…Little research has explored user experience of tunable, dimmable LED lighting systems of these varied lighting designs (Perumal et al, 2021). Aires et al applied tunable lighting in a controlled laboratory and a quasi-controlled field environment, finding inconsistent and inconclusive results between the two environments, with the authors suggesting testing lighting patterns in the field before implementing in a real environment (Aries et al, 2020). The acceptability of lighting technologies is contingent on user assessments of the light quality within specific environmental applications ( Assessment of Solid-State Lighting , 2017).…”

mentioning

confidence: 99%

Lighting the Patient Room of the Future: Evaluating Different Lighting Conditions From the Patient Perspective

DuBose

Davis

Campiglia

et al. 2021

HERD

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Objective: This study explores whether “future” lighting systems that provide greater control and opportunity for circadian synchronization are acceptable to participants in the role of patients. Background: Tunable, dimmable light emitting diode systems provide multiple potential benefits for healthcare. They can provide significant energy savings, support circadian synchronization by varying the spectrum and intensity of light over the course of the day, address nighttime navigation needs, and provide user-friendly control. There is an emerging understanding of the important visual and nonvisual effects of light; however, important questions remain about the experience and acceptability of this “future” lighting if we are to adopt it broadly. Methods: Volunteer participants (34) performed a series of tasks typical of patients, such as reading or watching a video, in a full-scale simulated inpatient room. Each participant conducted these tasks under 12 lighting conditions in a counterbalanced order that included varying illuminance levels, correlated color temperatures (CCTs), and in a few conditions, saturated colors. The participants rated each lighting condition on comfort, intensity, appropriateness, and naturalness. Results and Conclusions: The participants found that conditions with CCTs of 5,000 K and higher were significantly less comfortable and less natural than conditions with lower CCTs. Conditions with lighting distributed in multiple zones in the patient room were viewed more favorably than a traditional overbed configuration. The participants in this simulated patient study reacted negatively to colored lighting on the footwall of the room but found a mixture of warmer and cooler luminaire CCTs acceptable.

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Assessment protocol and effects of two dynamic light patterns on human well-being and performance in a simulated and operational office environment

Cited by 24 publications

References 57 publications

Abrupt light transitions in illuminance and CCT result in different temporal dynamics and interindividual variability for sensation, comfort and alertness

Abrupt light transitions in illuminance and CCT result in different temporal dynamics and interindividual variability for sensation, comfort and alertness

Tackling Heterogeneous Color Registration: Binning Color Sensors

Lighting the Patient Room of the Future: Evaluating Different Lighting Conditions From the Patient Perspective

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