Thanks for the encouragement Guys.
This is a healthy dialog. There are two challenges here:
1) There is no true-true white, measured or otherwise. What looks white to people is only white because our eyes have been looking at the sun for thousands of years. If our sun had been 1000 kelvin bluer for the last 100,000 years, 6000K would be an ideal.
2) This isn't like the boiling point of water at sea level or the atomic weight of X element. As much as we try to control this with fancy measures, it comes down to simple perception.
In my case, rather than basing this on incan or LED ideals, I'm trying to select a single point that can represent both with a single, common scale. In other words, look at a finished sample and say "yea, thats what my light output looks like" and know that the other samples are good predictors of what
that light will look like. When I have time for more testing, I'll try several example packs calibrated to different white points. Then ask myself "which point represents what I'm seeing."
I like the idea of making a thread for this. I'll see about that when I have the methodology down. Sneak preview: I may have a way to measure and include the actual K of each light source.