Measurement of Circadian Effectiveness in Lighting for Office Applications
Sebastian Babilon,Sebastian Beck,Julian Kunkel,Julian Marcel Klabes,Paul Myland,Simon Benkner,Tran Quoc Khanh +6 more
TLDR
A novel methodological framework for spatially resolved light measurements is proposed that allows for an estimate of the circadian effectiveness of a lighting situation for variable field of view (FOV) definitions and is compared to standard spectral radiometry to validate the accuracy of the proposed approach.Abstract:
As one factor among others, circadian effectiveness depends on the spatial light distribution of the prevalent lighting conditions. In a typical office context focusing on computer work, the light that is experienced by the office workers is usually composed of a direct component emitted by the room luminaires and the computer monitors as well as by an indirect component reflected from the walls, surfaces, and ceiling. Due to this multi-directional light pattern, spatially resolved light measurements are required for an adequate prediction of non-visual light-induced effects. In this work, we therefore propose a novel methodological framework for spatially resolved light measurements that allows for an estimate of the circadian effectiveness of a lighting situation for variable field of view (FOV) definitions. Results of exemplary in-field office light measurements are reported and compared to those obtained from standard spectral radiometry to validate the accuracy of the proposed approach. The corresponding relative error is found to be of the order of 3–6%, which denotes an acceptable range for most practical applications. In addition, the impact of different FOVs as well as non-zero measurement angles will be investigated.read more
Citations
More filters
Journal ArticleDOI
A Randomized Controlled Trail for Comparing LED Color Temperature and Color Rendering Attributes in Different Illuminance Environments for Human-Centric Office Lighting
Sujung Lee,Heakyung C. Yoon +1 more
TL;DR: The findings are that LEDs with lower CRI values at warm color temperatures and LEDs with higher CRIvalues at cool temperatures provide the right level of color attributes for office lighting.
Journal ArticleDOI
The Necessity for Multi-Spectral Simulations of the Indoor Non-Visual Luminous Environment: A Simplified Annual Approach
Jaka Potočnik,Mitja Košir +1 more
TL;DR: In this article , the non-visual content was evaluated using novel metrics, the Autonomy of Circadian Potential and Circadian Autonomy, which assess temporal circadian luminous content.
Journal ArticleDOI
Processing RGB Color Sensors for Measuring the Circadian Stimulus of Artificial and Daylight Light Sources
TL;DR: The use of RGB color sensors is shown to be suitable for estimating the circadian effectiveness of both types of illumination with sufficient accuracy for practical applications and is suitable for estimates of the physiologically relevant circadian stimulus (CS) metric.
Journal ArticleDOI
Modeling the influence of nighttime light on melatonin suppression in humans: milestones and perspectives
TL;DR: A review of the main metrics developed so far to correlate physical properties of light and its effects on melatonin suppression is presented in this paper , where the authors present milestones in this research field, together with discussion on the advances, limitations and perspectives of application for distinct available models.
Journal ArticleDOI
Study protocol for measuring the impact of (quasi-)monochromatic light on post-awakening cortisol secretion under controlled laboratory conditions
TL;DR: The current work provides the study protocol for an ongoing research project that is intended to explore the spectral dependencies and to discuss measures of emotional state and cognitive functioning potentially related to the cortisol awakening response.
References
More filters
Journal ArticleDOI
Lighting scheme recommendation for interior workplace to adjust the phase-advance jet lag
TL;DR: In this paper, the authors explored the proper light scheme for improving performance and alleviating the negative effects of phase-advance jet lag in a simulated eastward flight, where participants were assigned to three groups according to lighting conditions: (1) control lighting group (CLG), (2) low-intervention group (LIG), and (3) high intervention group (HIG).
Journal ArticleDOI
Red light: A novel, non-pharmacological intervention to promote alertness in shift workers.
Mariana G. Figueiro,David Pedler +1 more
TL;DR: These field results partially support the laboratory results that showed a positive effect of red light for promoting alertness and certain performance outcomes during the day and at night.
Journal ArticleDOI
Light-induced Resetting of Circadian Rhythms in Humans
TL;DR: Property of light stimuli that are important for resetting the human circadian system are discussed, and knowledge can potentially be applied to improve light therapy for circadian rhythm sleep disorders, and to help reset circadian rhythms in individuals exposed to shift.
Journal ArticleDOI
Illumination of Upper and Middle Visual Fields Produces Equivalent Suppression of Melatonin in Older Volunteers
TL;DR: Results indicate that bright light treatments placed above the eye level might be as effective as those requiring patients to look directly at the light source, and demonstrate that significant suppression of melatonin may be achieved through the use of bright light in healthy older volunteers.
Journal ArticleDOI
Insufficient melanopic equivalent daylight illuminance in nursing home dementia units across seasons and gaze directions
Eirin Kolberg,Ståle Pallesen,Ståle Pallesen,Ståle Pallesen,Gunnhild Johnsen Hjetland,Inger Hilde Nordhus,Inger Hilde Nordhus,Eirunn Thun,Elisabeth Flo-Groeneboom +8 more
TL;DR: The ubiquity of insufficient melanopic equivalent daylight illuminance in dementia units suggests a role for lighting interventions in future research seeking to improve entrainment, sleep and mental health of dementia unit residents.