colour rendering index

Definition: Measure of how well a light-source renders a range of colours: a monochromatic light-source renders colours poorly: its rendering index is low: 20; sunlight renders colours well: its rendering index is high: 100. * There are two methods of calculating the index, based on the CIE chromaticity diagram or on the spectrum of emitted light.
Win some, lose some
In experiments comparing the colour rendering index with the efficiency of lamps in terms of how much light is emitted per watt of electricity, it has been found that generally the most efficient lights have the poorer colour rendering index.

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