Summary
This simulation study demonstrates that current office lighting standards, which focus only on photometric quantities like illuminance and glare, fail to account for non-visual (circadian) health effects, and that design parameters such as exterior ground plane color and window size significantly influence workers' effective light exposure. Practically, using bluish exterior ground surfaces and positioning workstations to face windows can optimize circadian-relevant light while managing visual comfort trade-offs.
Key Findings
- Exterior ground plane color is the most influential design parameter for non-visual (circadian) light evaluations, while luminous reflectance is most influential for visual evaluations.
- The effects of exterior ground plane color and luminous reflectance on visual and non-visual criteria are reversed — what optimizes visual comfort may not optimize circadian light exposure.
- Facing the window and using bluish exterior ground plane materials produced the best outcomes for health-related non-visual light effects in simulated IEA Task 27 reference office scenarios.
- Simulations were conducted using Radiance software on a standard reference office, highlighting that standard photometric recommendations do not address effective (circadian) luminous radiation.
Categories
Workplace Performance: Investigates how office design parameters affect both visual comfort and non-visual health effects for office workers.
The Science of Light: Explores the distinction between photometric quantities and effective luminous radiation relevant to non-visual (circadian) effects, using spectral simulations.
Sleep & Circadian Health: Addresses non-visual (circadian/health-related) effects of light in office environments and how design choices influence effective luminous radiation exposure.
Author(s)
P KHADEMAGHA, JF DIEPENS
Publication Year
2015
Number of Citations
5
Related Publications
Workplace Performance
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- Can light make us bright? Effects of light on cognition and sleep
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The Science of Light
- Phototransduction by retinal ganglion cells that set the circadian clock
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- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
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Sleep & Circadian Health
- Phototransduction by retinal ganglion cells that set the circadian clock
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- The two‐process model of sleep regulation: a reappraisal
- Melanopsin is required for non-image-forming photic responses in blind mice
- Strange vision: ganglion cells as circadian photoreceptors