Laser & Optoelectronics Progress, Volume. 56, Issue 24, 243301(2019)
Variation of Non-Visual Biological Effect of LED Lighting with Color Temperature
In this study, eight LED lighting sources with a large color-temperature range (2678-7258 K), especially the ultralow-color-temperature LED, are selected to quantitatively analyze the variation in the non-visual biological effect of LED lighting with the color temperature. The spectral distribution data for the visible band at 380-800 nm are collected. The color-coordinate Z value of the 1931CIE-XYZ standard chromaticity system, the blue-light proportion RC of the 415-508-nm band, and the rhythm factor KC denote that the non-visual biological effect of the LED light source increases along with an increase in the color temperature from 2678 K to 7258 K. Furthermore, the color-coordinate Z value of the 1931 CIE-XYZ standard colorimetric system and the blue-light proportion at 415-508 nm can be used for quantitatively characterizing the strength of the non-visual biological effect. The functional expressions with respect to the changes in the color-coordinate Z value, the blue-light proportion RC in 415-508 nm, and the rhythm factor KC with the color temperature are Z=0.01499+5.24009×10 -5×TC, RC=1.41985+0.00508×TC, and KC=0.11895+6.06953×10 -4×TC, respectively. Further, the corresponding squares of the correlation coefficient R2 are 0.94427, 0.93589, and 0.9598. The functional expressions of the color-coordinate Z value and the blue-light proportion RC at 415-508 nm with respect to the rhythm factor KC are KC=11.40331×Z-0.01209 and KC=0.11698×RC + 0.00618, respectively; the squares of the correlation coefficient R2 are 0.97991 and 0.97644, respectively. These observations can be used for the quantitative analysis of the non-visual biological effect of the LED lighting sources and provide guidance for the development of high-quality-health LED illumination products.
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Chaopu Yang, Wenqing Fang, Changwan Han, Fan Yang, Mingbao Liu. Variation of Non-Visual Biological Effect of LED Lighting with Color Temperature[J]. Laser & Optoelectronics Progress, 2019, 56(24): 243301
Category: Vision, Color, and Visual Optics
Received: Apr. 8, 2019
Accepted: Jun. 13, 2019
Published Online: Nov. 26, 2019
The Author Email: Fang Wenqing (fwq@ncu.edu.cn)