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Title: Estimation of possible suppression of melatonin production caused by exterior lighting in commercial business districts in metropolises
Authors: Chen, S 
Wei, M 
Dai, Q
Huang, Y
Issue Date: 2020
Source: Leukos, 2020, v. 16, no. 2, p. 137-144
Abstract: ABSTRACT : Policymakers and standardization bodies have started to make recommendations about the use of lighting products at night, with the goal of reducing negative impacts on human health. We report a series of field measurements to quantify the responses of different human photoreceptors and the possible suppression of melatonin production caused by the exterior lighting in metropolises. In total, 888 spectral and 888 illuminance measurements were taken at 5.6 ft. above the ground in six commercial business districts, with three in Hong Kong and three in Shanghai. It was found that 47% and 86% of the measured light stimuli in Shanghai and Hong Kong may introduce suppression of melatonin production, as characterized using circadian stimulus (CS), because they had CS values beyond 0.05, a working threshold for acute melatonin suppression. In addition, both field measurements and computer simulations suggested that light stimuli with higher correlated color temperature (CCT) may not necessarily cause stronger melatonin suppression than those with lower CCT values.
Keywords: Circadian rhythm
Exterior lighting
Publisher: Taylor & Francis
Journal: Leukos 
ISSN: 1550-2724
EISSN: 1550-2716
DOI: 10.1080/15502724.2018.1523013
Rights: © 2019 The Author(s). Published with license by Taylor & Francis Group, LLC. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way.
The following publication Siyuan Chen, Minchen Wei, Qi Dai & Yingying Huang (2020) Estimation of Possible Suppression of Melatonin Production Caused by Exterior Lighting in Commercial Business Districts in Metropolises, LEUKOS, 16:2, 137-144, is available at
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