White balance doesn't match CR2 EXIF colour temperature after import?

Why does Lightroom make it's own choice of white balance for "as shot"?
My CR2s from both a 40D and previous 350D all exhibit a shift in colour temperature compared to the EXIF data. It's not even consistent and a sequence of shots can visibly differ.
I know that camera auto white balance has its issues, but it does look like the camera makes a better initial guess than LR....
Thanks,
Barrie

The numbers are dependent on the mathematical model used to model the distribution of wavelengths in the lightsource. The details are rather heady, but indeed, the black body temperature is not as well defined as you might think. This is because a lightsource is seldom an actual black body radiator (not even the sun is due to atmospheric absorption, diffuse scattering on dust particles, and Raleigh scattering on the air molecules). If it were you would not need the "tint" number to describe it. There are quite a few different models for this in use and so it is not strange to see different numbers for the same conditions. In ACR/lightroom they are even dependent on the camera profile if I understand this correctly. Bottom line is that what is neutral in the camera system is neutral in the ACR/Lightroom number system. That's all you need to know. 

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