The optimum spectral distribution of warm white lighting for social purposes was investigated in a mass test; 1,300 observers compared metameric sources for lighting girls' faces. The results indicate that a lamp with enhanced red and green at the expense of yellow spectral content would be widely preferred to a metameric Planckian radiator.
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References
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EdwardsE. A. and DuntleyS. Q., Am. Journ. Anatomy, 65, 1 (1939).
