Color Temperature and White Balance
Different light sources have a different spectral curve.
Sources that are based on light emission from heated objects
(like the sun or a tungsten filament) can have their spectral output
characterized by a single number, the color temperature.
Other sources such as fluorescent lights and LED emitters can have odd spectral curves
which cannot be so easily characterized (though some kind of useful approximation can be
and often is sometimes made).
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Tom's Photography Info / tom@mmto.org