Wikipedia on D65:
"roughly midday sun in Western / Northern Europe"
http://en.wikipedia.org/wiki/D65
I don't have these texts, but might conditions like location and time of
year be described in CIE 15.2 Colorimetry or ISO/CIE 15026?
However, with the sun's activity having changed/increased since
1931/1964, readings today are bound to differ. Plus the state the
different layers in the atmosphere are in fluctuates, as does the
weather, so both light source and diffuser are never really consistent.
(No offence towards the sun of course.)
Still, a good idea to take a measurement every once in a while. On a
clear day that is...
Greets,
Michel van Dijk
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