TY - JOUR
T1 - Ambient-task combined lighting to regulate autonomic and psychomotor arousal levels without compromising subjective comfort to lighting
AU - Hayano, Junichiro
AU - Ueda, Norihiro
AU - Kisohara, Masaya
AU - Yoshida, Yutaka
AU - Yuda, Emi
N1 - Funding Information:
The authors appreciate ENDO Lighting Corporation, Japan, for its financial support and lighting devices used for this study. The authors thank Mr. Naoyuki Suzuki and Ms. Haruka Maruyama, ENDO Lighting Corporation, Japan, and Mr. Kimihiro Nakamura, Nikken Sekkei, Ltd., Japan, for his important advice on this study. The software of PS-PVT is available from the corresponding author on reasonable request. Also, the datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12
Y1 - 2021/12
N2 - Background: Although evidence of both beneficial and adverse biological effects of lighting has accumulated, biologically favorable lighting often does not match subjectively comfortable lighting. By controlling the correlated color temperature (CCT) of ambient lights, we investigated the feasibility of combined lighting that meets both biological requirements and subjective comfort. Methods: Two types of combined lightings were compared; one consisted of a high-CCT (12000 K) light-emitting diode (LED) panel as the ambient light and a low-CCT (5000 K) LED stand light as the task light (high-low combined lighting), and the other consisted of a low-CCT (4500 K) LED panel as the ambient light and the same low-CCT (5000 K) stand light as the task light (low-low combined lighting) as control. Ten healthy subjects (5 young and 5 elderly) were exposed to the two types of lighting on separate days. Autonomic function by heart rate variability, psychomotor performances, and subjective comfort were compared. Results: Both at sitting rest and during psychomotor workload, heart rate was higher and the parasympathetic index of heart rate variability was lower under the high-low combined lighting than the low-low combined lighting in both young and elderly subject groups. Increased psychomotor alertness in the elderly and improved sustainability of concentration work performance in both age groups were also observed under the high-low combined lighting. However, no significant difference was observed in the visual-analog-scale assessment of subjective comfort between the two types of lightings. Conclusions: High-CCT ambient lighting, even when used in combination with low-CCT task lighting, could increase autonomic and psychomotor arousal levels without compromising subjective comfort. This finding suggests the feasibility of independent control of ambient and task lighting as a way to achieve both biological function regulation and subjective comfort.
AB - Background: Although evidence of both beneficial and adverse biological effects of lighting has accumulated, biologically favorable lighting often does not match subjectively comfortable lighting. By controlling the correlated color temperature (CCT) of ambient lights, we investigated the feasibility of combined lighting that meets both biological requirements and subjective comfort. Methods: Two types of combined lightings were compared; one consisted of a high-CCT (12000 K) light-emitting diode (LED) panel as the ambient light and a low-CCT (5000 K) LED stand light as the task light (high-low combined lighting), and the other consisted of a low-CCT (4500 K) LED panel as the ambient light and the same low-CCT (5000 K) stand light as the task light (low-low combined lighting) as control. Ten healthy subjects (5 young and 5 elderly) were exposed to the two types of lighting on separate days. Autonomic function by heart rate variability, psychomotor performances, and subjective comfort were compared. Results: Both at sitting rest and during psychomotor workload, heart rate was higher and the parasympathetic index of heart rate variability was lower under the high-low combined lighting than the low-low combined lighting in both young and elderly subject groups. Increased psychomotor alertness in the elderly and improved sustainability of concentration work performance in both age groups were also observed under the high-low combined lighting. However, no significant difference was observed in the visual-analog-scale assessment of subjective comfort between the two types of lightings. Conclusions: High-CCT ambient lighting, even when used in combination with low-CCT task lighting, could increase autonomic and psychomotor arousal levels without compromising subjective comfort. This finding suggests the feasibility of independent control of ambient and task lighting as a way to achieve both biological function regulation and subjective comfort.
KW - autonomic nervous system
KW - blue light
KW - color temperature
KW - combined lighting
KW - continuous performance
KW - heart rate variability
KW - intrinsically photosensitive retinal ganglion cell
KW - light emitting diode
KW - non-image forming function
KW - psychomotor vigilance
KW - subjective comfort
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UR - http://www.scopus.com/inward/citedby.url?scp=85112066397&partnerID=8YFLogxK
U2 - 10.1186/s40101-021-00258-w
DO - 10.1186/s40101-021-00258-w
M3 - Article
C2 - 34372917
AN - SCOPUS:85112066397
SN - 1880-6791
VL - 40
JO - Journal of Physiological Anthropology
JF - Journal of Physiological Anthropology
IS - 1
M1 - 8
ER -
