A model for a two-source illuminant allowing daylight colour adjustment

• Published in: Lighting research & technology (London, England : 2001) Vol. 48; no. 2; pp. 239 - 252
• Main Authors: Miller, ME, Gilman, JM, Colombi, JM
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01-04-2016
• Subjects: Bandwidth; Color; Colour; Daylight; Emitters; Illumination; Light sources; Rendering
• ISSN: 1477-1535; 1477-0938
• DOI: 10.1177/1477153514559796

A model is presented which determines the optimal placement of narrow-band emitters in a pair of light sources, where the correlated colour temperature (CCT) of the illumination is controlled by varying the relative intensity of the light sources. This model was exercised to determine optimally-placed 30 nm and 60 nm bandwidth emitters across the target range of CCTs. The results suggest that a lamp capable of high Colour Rendering Index values with respect to daylight illumination across CCT values between 4000 K and 10 000 K can be formed from as few as three independently-selected 30 or 60 nm bandwidth emitters within each source. However, when the model is constrained to require the same emitters in both light sources, adequate colour rendering requires at least four 30 nm or three 60 nm bandwidth emitters.