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Sunlight
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Sunlight


  • Subject: Sunlight
  • From: Roger Breton <email@hidden>
  • Date: Sun, 18 Nov 2007 14:10:04 -0500

Hello folks,

I have uploaded a PDF for discussion, here :

   http://homepage.mac.com/graxx/FileSharing4.html

Hope you can all access and view it. It's a PDF I created that compare a
measurement of direct sunlight, made with the Spectrocam, entering my home
studio and D50, in the range of 350nm to 750nm.

In my measurement, it is clear I lack some energy in the "blue" part of the
spectrum. This, I suspect, is due to the fact that I was only sampling
'direct sunlight' and there were no contribution for 'skylight'. If we
disregard that aspect of the measurement, I think this spectrum is pretty
convincing of what 'real" direct sunlight ought to looks like for the
latitudes I live in (and given the fact that the light I measured was
partially filtered with the glass of my window, which might absorb some
energy at some wavelengths).

The question I have is how best to measure the 'mix' of skylight and direct
sunlight to better correspond with D50?

Roger Breton


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