Journal of South China University of Technology(Natural Science) >

2021 , Vol. 49 >Issue 4: 117 - 123

DOI: https://doi.org/10.12141/j.issn.1000-565X.200351

Traffic & Transportation Engineering

Influence of LED Color Temperature on Visual Performance During the Process of Dark Adaptation in Tunnels

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  • 1. Key Laboratory of Offshore Geotechnics and Material of Zhejiang Province, Zhejiang University, Hangzhou 310058, Zhejiang, China; 2. The Engineering Research Center of Oceanic Sensing Technology and Equipment, Ministry of Education, Zhejiang University, Zhoushan 316021, Zhejiang, China;3. Hangzhou Dajiangdong Urban Utility Management & Maintenance Co., Ltd, Hangzhou 311200, Zhejiang, China; 4. Wenzhou Highway and Transportation Management Center, Wenzhou 325000, Zhejiang, China;5. College of Computer Science and Technology, Zhejiang University, Hangzhou 310007, Zhejiang, China
康诚(1988-),男,博士生,主要从事隧道照明研究。E-mail:gronckle_kang@163.com

Received date: 2020-06-24

  Revised date: 2020-09-30

  Online published: 2020-10-06

Supported by

Supported by the Key R&D Projects of Zhejiang Province(2018C03029)

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Abstract

The study aims to investigate the effect of color temperature of tunnel LED light source on pupil diameter, variation ratio of pupil area and reaction time during the dark adaptation through visual performance experiments. Results show that the process of dark adaptation can be divided into two stages, namely, the early stage and the middle-late stage. The early stage lasts about 2s, during which the variation ratio of pupil area exceeds 70% frequently and the blinking frequency rises up to 1.7times/s. The middle-late stage lasts about 20s, during which the variation ratio of pupil area remains in the range of ±4% and blinking frequency returns to normal level. The higher color temperature of LED light source is, the smaller pupil area, lower visual load and faster reaction time is during the early stage. Intermediate color temperature gives rise to a relatively higher visual performance during the middle-late stage. Accordingly, the recommended color temperature of LED light source in threshold zone and transition zone was proposed.

Key words： LED; color temperature; dark adaptation stage; visual performance; eye movement characteristic

Cite this article

KANG Cheng, LI Wenhui, WANG Zhaohui, et al . Influence of LED Color Temperature on Visual Performance During the Process of Dark Adaptation in Tunnels[J]. Journal of South China University of Technology(Natural Science), 2021 , 49(4) : 117 -123 . DOI: 10.12141/j.issn.1000-565X.200351

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