Color Temperature Classification of Natural and Artificial Illuminants

Mar 01, 1928

This paper discusses the need for a quality rating of artificial light sources on the basis of color temperature and presents on two scales a large number of color temperature values for sunlight and daylight, together with the measurements on over thirty glasses which with gas-filled tungsten filament lamps will result in a range in apparent color temperatures from 2100 degrees absolute to 30,000 degrees absolute. A new instrument is illustrated for color temperature determinations. Reference is made to the quality spread in natural daylight with the means for producing a corresponding range in artificial daylighting accessories, and the various color of light qualities for particular color work are discussed.

Norman MacBeth
Presented at: 
Annual Convention of the Illuminating Engineering Society
Published & professionally reviewed by: 
Illuminating Engineering Society (IES)

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