standard illuminant A

[4.9.3.1] A blackbody at a temperature of 2856 K, using c2 = 1.4388 (see Planck radiation law). It is defined by its relative spectral power distribution over the range from 300 to 830 nm.*

 

* Rea MS (ed.). The IESNA Lighting Handbook, 9th ed. New York: Illuminating Engineering Society of North America; 2000. Figure 4-3. 

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