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illuminant

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illuminant (In French illuminant) defined spectral radiation distribution (spectral characteristic) of a light source, i.e. their shares in the blue, green and red areas of the visible spectrum, with respect to the effect of optical brighteners but also to their shares in the area close to UV; important standard illuminants: A (lightbulb), D50 (neutral daylight, standard in the printing and media industries), D65 (medium daylight), TL84 (store light/three-band lamp).