Illuminant D65 - History

History

For more details on this topic, see Standard illuminant#Illuminant series D.

The CIE introduced three standard illuminants in 1931:

  • A: Incandescent bulb simulator
  • B: Daylight simulator (direct)
  • C: Daylight simulator (shade)

B and C were derived from A by using liquid filters. The approximation to real light this provided was found lacking, so in 1967 the CIE accepted a proposal by Judd, MacAdam, and Wyszecki for a new series of daylight simulators, bearing the initial D.

Read more about this topic:  Illuminant D65

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