standard illuminant D65

[4.9.3.3] A representation of daylight at a correlated color temperature of approximately 6500 K. It is defined by its relative spectral power distribution over the range from 300 to 830 nm.*

Note: At present, no manufactured source for matching this illuminant has been recommended.

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