color temperature

the temperature in kelvin (K) of a nonblack body indicated by the temperature to which a black body would need to be heated to give the same spectral distribution as that of the nonblack body. For example, candlelight has a color temperature of 1500 K, whereas blue sky is over 9000 K.

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Psychology term of the day

May 9th 2024

illumination unit

formerly, the amount of light produced by one foot-candle: now replaced by the lux.