Nikon D6 Reference Manual page 278

A
The [White Balance] Options
White balance can also be adjusted from the
photo and movie shooting menus.
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[Natural Light Auto]
[Natural light auto] may not produce the desired results under artificial
light. Choose [Auto] or an option that matches the light source.
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Color Temperature
The perceived color of a light source varies with the viewer; some may
have a red cast while others appear blue. Color temperature is an
objective measure of the color of a light source, expressed in Kelvins (K).
The lower the color temperature, the redder the cast (
temperature, the bluer the cast (
3000
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Choosing a Color Temperature
In general, choose lower values if your pictures have a red cast or to
intentionally make pictures bluer, higher values if your pictures are tinged
blue or to intentionally make pictures redder.
226
Achieving Natural Colors with Different Light Sources (White Balance)
w ).
4000 5000
q ); the higher the
6000 8000 10000 [ K ]