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daylight, diurnal light

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daylight, diurnal light (In French lumière du jour) spectral radiation distributions defined by the CIE which are oriented towards different sun position and solar radiation angle phases (daylight phases) and which can be copied as “artificial daylight” with the help of technical light sources: D50 = 5003 Kelvin, D55 = 5503 K, D65 = 6504 K, D75 = 7504 K. The definition includes the respective natural UV shares of the sunlight.