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  • Light sources in a retail display with different colour temperature and colour rendering properties

What is Colour Rendering Index?

Colour rendering index (CRI) is a widely used measurement for describing how “accurately” a light source can visually reproduce the colour of an object (compared to a reference light source). This has become more important, as new light sources such as LEDs are more commonly being used in home and commercial environments.

CRI uses 15 standard colours and an average value (Ra) to express the performance of a lightsource for the accurate appearance of the 15 standard colours.

A graphic that shows the 15 CRI Test colours R1-R15
Colour Rendering Index Tutorial
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Measure CRI

Measure Color Rendering Index with the CL-500A

The CL-500A is a Spectral Illuminance Meter for measuring Illuminance and spectral power distribution from lightsources.

CL-500A Spectral Illuminance Meter
Colour rendering is being measured in a museum setting with an illuminance spectrophotometer.
Learn more about Measurement Solutions for Lit Environments

Luminance Meters, Illuminance Meters, Spectroradiometers and more, Konica Minolta Sensing supply a range of solutions for all needs and budgets.

Solutions for the Installation and Maintenance of Lighting
a stylish modern residential property with many different colours of light installed