Definition: Noun: (1) Light that comes more or less directly from sun: it varies very widely in brightness, colour and quality. (2) A notional standard light: an average mixture of sunlight and skylight with some clouds typical of temperate latitudes around midday. * Such light has colour temperature of 5400-5900 K. Adjective: (3) ~ film: one whose colour balance is correct for light-sources whose colour temperature is 5400-5600 K. (4) ~ artificial light-source e.g. ~ light bulb: one whose colour rendering index approximates that of daylight i.e. a certain set of standard colours will appear the same colour when seen by this light-source as by daylight.

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