Fabrication of Circadian Light Meter with Non-Periodic Optical Filters to Evaluate the Non-Visual Effects of Light on Humans

Applied Sciences

Changwook Kim¹  Young Rag Do²  Yun Jae Eo²  Keyong Nam Lee²  Seohyeon Kim³  Seung Min Lee³  Dae Hwan Kim³ 

[1] Circadian ICT Research Center, Kookmin University, Seoul 02707, Korea;Department of Chemistry, Kookmin University, Seoul 02707, Korea;School of Electrical Engineering, Kookmin University, Seoul 02707, Korea;

关键词: artificial lighting;    melanopic equivalent daylight illuminance;    circadian illuminance;    circadian rhythm;    light meter;    optical filter;   

DOI  :  10.3390/app11188283

来源: DOAJ

【 摘 要 】

Given that light is known to function as a zeitgeber, having the greatest influence on the human circadian rhythm, it is necessary to assess the effects of light on humans with the goal of maintaining the circadian rhythm. Herein, we fabricated a simple circadian light meter that directly measures the non-visual effects of light using optical filters that mimic the non-visual action spectrum. The fabricated light meter was calibrated and verified through the values obtained from a conventional illuminance spectrophotometer. Furthermore, during 24 h of everyday life, 11 participants wore hats equipped with the developed light meter so that we could investigate the effects of the light environment to which they were exposed to, both indoors and outdoors. For comparison, natural outdoor illumination was also measured with the same light meter. Based on the considerable difference between the light exposure levels during the daytime and nighttime, it is possible that the participant’s melatonin levels would be impacted by the light exposure measured by the light meter. Consequently, based on the light exposure measurements made in this study, the proposed circadian light meter would be a valuable tool for real world circadian lighting studies that require actual light dose to the eyes of the test subjects.

【 授权许可】

Unknown