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Light is electro-magnetic radiation which becomes visible to the human eye in a wavelength range from 360nm (violet) to 780nm (red).
With the help of the CIE colour triangle, the colours of light sources and bodies can be determined by the content of two standard colours corresponding to the values x and y. These values can be measured. Through additive colour mixing, LED technology can generate all colours included in the area spanned by the colour locations of the applied LEDs. Using additive colour mixing with two components, the resulting chromaticity is by definition located on a straight line connecting these two components. Any point on the colour chart represents the location of one distinct chromaticity. Colours of identical chromaticity differ only by brightness (saturation). In the central part of the colour chart, where x=0.33 and y=0.33, the so-called achromatic locus is to be found (white, grey, black, depending on brightness). The contour of the colour chart consists of the spectrum locus from 380nm (blue violet) to 780nm (dark red) and the so-called purple boundary.
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