Preferred chromaticity of color-tunable LED lighting

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Journal titleLEUKOS
Pages101115; # of pages: 15
SubjectLight-emitting diode; LED; ofice lighting; spectral tuning; colour tuning; personal preference; individual lighting control; colour quality metrics
AbstractPrevious research has demonstrated that individual personal control over light level benefits individuals and organizations. As a first step toward testing whether light source spectrum choices—which are possible with light emitting diode (LED) systems—offer similar benefits, we examined preferences for various spectra in a scale model of an office. Participants judged the model’s brightness, colorfulness, and pleasantness when lit with five preset spectra with measured correlated color temperatures (CCTs) of 2855, 3728, 4751, 5769, and 6507 K created with five LED channels and one fluorescent spectrum (3750 K measured), all at approximately 500 lx. Then they chose their preferred light spectrum using the five LED channels, once as a free choice and once with an illuminance limit. Judgments of the fluorescent spectrum and the LED spectrum with the closest (matched) CCT did not differ. The preset judgments followed a quadratic pattern, with the lowest and highest CCT conditions having lower ratings than the three middle conditions. The free and illuminance-constrained lighting choices did not differ, with individuals’ selections ranging from 2850 to 14,000 K and generally lying slightly below the blackbody curve.
Publication date
AffiliationConstruction; National Research Council Canada
Peer reviewedYes
NRC numberNRC-CONST-56105
NPARC number21270985
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Record identifier01cd7b54-3007-4487-9e17-5c6856db8000
Record created2014-03-03
Record modified2016-05-09
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