Color Rendereing Index. The evaluation of the effect of a light source on the color appearance of the objects in comparison with their color appearance under a reference light source. The higher the index moves toward the maximum of "100", the better the color reproduction.
A number used for rating lite bulbs on a scale up to 100, where 100 is equal to sunlight.
COLOUR RENDERING INDEX. A CIE scale used to indicate the colour rendering accuracy of a light source compared to a reference source of the same colour temperature, and is the average for eight standard colours, Ra8. Expressed on a scale of 1 to 100, a value of 100 indicates no distortion. A low CRI rating indicates that the colours of objects will appear distorted under that particular light source.