Bob, I politely disagree: Most of the graphic arts have standardisen on a specific daylight (D50) to be able to have a specific defined lightsourcs, as opposed to daylight. The spectral properties in daylight can vary a great deal, and pending on the high wavelength component optical brightener in a paper will be triggered by different amounts changing not only amount of apparent light but also the colour that the eye use as white point.
Dear Thomas
To which I would only wish to add....What do you do for standard illumination without a light booth if the daylight is not there....a real possibility in the UK and I suspect even down in southern Cornwall <G> What when we are forced to work late into the night! But seriously, I think Bob is pulling our legs!!
Cheers
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