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Luminance-Brightness Discrepancy in Near White Lights

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The present study introduces interesting disagreement phenomena between luminance and brightness in near white colors reproduced using LEDs. Target stimuli having identical luminance and chrominance (CCT) appeared to have different brightness. Observers tended to choose brighter one from the two target stimuli in contrary fashion. The relative quantities of the ipRGC (intrinsically photosensitive retinal ganglion cells), S-cones, and rods were compared over the stimuli besides the luminance, i.e., photometric quantity. An apparent reason for the discrepancy could not be revealed in this study; however it could be induced that the contribution of S-cone, rod, and ipRGC (circadian) photosensitive receptors as well as L- and M-cones to the brightness perception causes the discrepancy results.
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Document Type: Research Article

Publication date: January 1, 2012

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  • CIC is the premier annual technical gathering for scientists, technologists, and engineers working in the areas of color science and systems, and their application to color imaging. Participants represent disciplines ranging from psychophysics, optical physics, image processing, color science to graphic arts, systems engineering, and hardware and software development. While a broad mix of professional interests is the hallmark of these conferences, the focus is color. CICs traditionally offer two days of short courses followed by three days of technical sessions that include three keynotes, an evening lecture, a vibrant interactive (poster) papers session, and workshops. An endearing symbol of the meeting is the Cactus Award, given each year to the author(s) of the best interactive paper; there are also Best Paper and Best Student Paper awards.

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