Colour temperature

Colour temperature is a measure of the colour of a light source.

The filament of a conventional incandescent lamp has a temperature of about 2500 Kelvin, so its colour temperature is said to be 2500K.

Light sources which are redder have a lower colour temperature.

Light sources which are bluer have a higher colour temperature.

In photographic terms, 'daylight' is 5500K.

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