colour temperature

Definition: Measure of colour quality of source of light: expressed in Kelvin. * Colour of light is correlated to the temperature of black body radiator when colour of its radiation matches that of light being measured. * Warm or red colours are relatively 'cool' or are correlated to low colour temperatures; cold or blue colours are correlated to high colour temperatures.
Tempting colours
The approximate colour temperature of some common luminaires are: candle 1930 K
household tungsten bulb 2400 K
photoflood lamp 3400 K
noonday light 5400 K
average daylight 6500 K
blue sky 18000 K

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