The colour rendering index is a quality feature of artificial light (light sources) compared to natural light. A light source whose light contains all spectral colours, as in sunlight, makes the colours of the illuminated objects look natural - the colour rendering is optimal. The colour rendering index (CRI) defines the extent to which the light source reproduces the natural ambient colours on a scale from 0 to 100. The higher the CRI, the more natural the colours appear in the lamp light.

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