VISION EXPERIMENT ON ACCEPTABLE AND PREFERRED WHITE LIGHT CHROMATICITY FOR LIGHTING

Published

April 23, 2014

Author(s)

Yoshihiro Ohno, Mira Fein

Abstract

Standards on white light chromaticity of fluorescent lamps are available for more than three decades, but the specifications in these standards have not been based on human vision perception data. Anecdotes say lights with chromaticities below the Planckian locus would provide more preferred lighting for interior. A series of vision experiments have been conducted with 18 subjects on their response to Duv (distance from the Planckian locus on CIE 1960 (u, v) coordinates) using NIST Spectrally Tunable Lighting Facility, with 18 subjects for 6 Duv points (- 0.03, -0.02, -0.01, 0, 0.01, 0.02) at four correlated color temperatures, 2700 K, 3500 K, 4500 K, and 6500 K. The results show that Duv of around -0.015 (below Planckian locus) on the average is perceived most natural. This Duv level is outside the ranges specified by existing standards. This indicates that new lighting products having more preferred chromaticity than the current products may be possible.

Proceedings Title

Proc., CIE 2014 Lighting Quality and Energy Efficiency

Issue

CIE x039:2014

Conference Dates

April 24-26, 2014

Conference Location

Kuala Lumpur

Conference Title

CIE 2014 Lighting Quality and Energy Efficiency

Pub Type

Conferences

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Keywords

chromaticity, lighting, light sources, white light, Duv, correlated color temperature, visual perception, Planckian locus

Citation

Ohno, Y. and Fein, M. (2014), VISION EXPERIMENT ON ACCEPTABLE AND PREFERRED WHITE LIGHT CHROMATICITY FOR LIGHTING, Proc., CIE 2014 Lighting Quality and Energy Efficiency, Kuala Lumpur, -1, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=915672 (Accessed May 16, 2026)

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