Abstract
The lighting environment at indoor workplaces is important not only to provide vision and visual comfort, but also for light’s direct influence on human physiology, cognitive performance and mood. The purpose of this ongoing study is to investigate the impact of a dynamic control of combined daylight and artificial lighting on office users’ visual comfort as well as on alertness and cognitive performance. We are going to evaluate the impact of two different office lighting conditions in a quasi-real setting on subjective alertness ratings in healthy young participants over several days. We will compare an office with optimized daylighting and artificial lighting, operated by a new control system with a standard office room, where the lighting/shading can be changed manually. The aim of this balanced crossover within study design is to show that exposure to optimized dynamic lighting control over several days is superior on subjective alertness and glare indexes, when compared to a conventional lighting control. Here, we present some preliminary results from the first six participants on the comparison of subjective evaluations of alertness and the objective monitored (day-) light exposures and glare index Daylight Glare Probability (DGP) in the two different conditions over one week (five days) each.
Highlights
In the last two decades many studies have shown that light has a fundamental impact on human physiology and health, and can directly boost alertness, cognitive performance, as well as improve our mood [1], [2]
We are going to evaluate the impact of two different office lighting conditions in a quasi-real setting on subjective alertness ratings in healthy young participants over several days
Published under licence by IOP Publishing Ltd both natural and artificial light, has beneficial effects on the aforementioned aspects if compared to a manual lighting control. This ongoing study has started in September 2018. In this conference proceedings we present preliminary results of subjective alertness and Daylight Glare Probability (DGP) ratings for six study volunteers, as well as lighting parameters such as vertical illuminance, glare index and melanopic irradiance
Summary
In the last two decades many studies have shown that light has a fundamental impact on human physiology and health, and can directly boost alertness, cognitive performance, as well as improve our mood [1], [2]. The NonImage-Forming (NIF) effects of light are currently not sufficiently considered for lighting of indoor working environments such as in offices. Taking these effects into account is important to improve well-being and productivity of users. Published under licence by IOP Publishing Ltd both natural and artificial light, has beneficial effects on the aforementioned aspects if compared to a manual lighting control. This ongoing study has started in September 2018. Previous studies with similar objectives and innovative methodologies performed at EPFL indicated the need for integration of visual comfort, nonvisual light effects and thermal comfort in office spaces [3]–[6]
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