Abstract
A new light lab facility has been commissioned at Rochester Institute of Technology with the research goal of studying human visual adaptation under temporally dynamic lighting. The lab uses five-channel LED luminaires with 16 bits of addressable depth per channel, addressed via DMX. Based on spectral measurements, a very accurate multi-primary additive color model has been built that can be used to provide "colorimetric plus" multi-primary channel intensity solutions optimized for spectral accuracy, color fidelity, color gamut, or other attributes. Several spectral tuning and multi-primary solutions are compared, for which accuracy results and IES TM-30-15 color rendition measures are shown.
Highlights
Dynamic lighting is light that changes over time
Such a variation in color rendition, even if incompletely described by the averaging that results in these plots, might be distracting in a visual adaptation experiment that involves any colored objects. Another colorimetric plus solution was computed with an optimization function the distance in TM-30 (Rf, Rg) space to a goal of (85, 105), a point chosen because it is achievable for most correlated color temperature (CCT), even if it has lower Rf than the system can reach for some CCTs
The lab is designed for controlled visual experiments studying dynamic visual adaptation, meaning chromatic and luminance adaptation while the lighting changes over time
Summary
Dynamic lighting is light that changes over time. Natural light is typically dynamic, including daylight’s diurnal variation in color and intensity, the effects of weather, and the variation seen in daylight filtered through trees or reflected from water. Dynamic lighting systems are being designed to influence circadian rhythms, to dim in response to occupancy or daylight entrance, to attract attention, and for specific tasks like focused reading or calming effects. Recognizing the similarity between multi-channel (or multi-LED) lighting systems and multiprimary displays, a starting point is the colorimetric model often employed in 3-primary (RGB) display systems, with an accounting for a system nonlinearity and a matrix representing the linear combination of basis primaries that are assumed to be independent and colorimetrically stable. The structure of this model is the basis of standard RGB encodings like sRGB [3], and can be used to model most display systems [4].
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