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A Color Temperature
The perceived color of a light source varies with the viewer and other
conditions.
Color temperature is an objective measure of the color of a
light source, defined with reference to the temperature to which an
object would have to be heated to radiate light in the same
wavelengths.
While light sources with a color temperature in the
neighborhood of 5,000–5,500 K appear white, light sources with a lower
color temperature, such as incandescent light bulbs, appear slightly
yellow or red.
Light sources with a higher color temperature appear
tinged with blue.