Color Rendering Index (CRI)

The coloring index shows how purely light is produced and how well the luminaire displays the colors as they are. The color repetition index is 0-100 on a scale of 0-100, at zero the colors do not repeat and in 100 the coloring is complete, the sunlight is 100. The coloring index 80-90 is considered good, more than 90 is excellent.

The RA index is similar to cri. The RA measures colors using eight reference points, focusing on blue lights and leaving the red value unread. CRI measures the repetition of all colors, fifteen in total, and also the red color.

The general coloring index is 80-90. For sites in need of demanding colouring, the value can be 90-100, such as hospitals, museums and galleries, as well as facilities for photography and graphic design.

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Good coloring has a big impact. It can be used to highlight products sold in stores and to distinguish what color the products or furniture really are. Poor lighting also affects a person's mind and behavior. The weak coloring index displays colors in grey and lattes, for example.

The luminaire thus reproduces the actual tone of the colours the higher the CRI index.