I am using Ocean optics spectrometer having USB2000+ detector with LS-1 tungsten-Halogen lamp. While doing color measurements, we have to choose observer (2-degree/10-degree) and illuminant (D50, D55 etc.). What is the basis of choosing the observer? Is the illuminant code is based on the lamp color temperature? How can I get the code for the lamp? I am using LS-1 having color temperature 3100K. Can we do color measurements in both transmission and reflectance mode i. e. on glass and metal?
You need to read about colour management: the whole printing, paints, graphics industry have sorted this all out and established rigorous standards. You can buy consumer level programmes and devices to "measure" colour and relate spectral measurements to what the eye perceives as colour.
You may need to learn Kubelka-Munk theory. See particularly my publication "Optical absorption red and blue shifts in ZnFe2O4 nanoparticles", Materials Science and Engineering: B, Volume 153, Issues 1–3, 25 September 2008, Pages 70–77
http://www.sciencedirect.com/science/article/pii/S0921510708004972
I guess it would be better to discuss with OO support engineers. They know their instrument better. But first read application notes on web site of OO.
Good luck.
I have a blog post that may answer your question.
http://johnthemathguy.blogspot.com/2014/11/how-many-d65s-are-there-in-2-degree.html
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