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# CRI (colour rendering index)

> A 0–100 score of how faithfully a light source reproduces colours compared with a reference light.

Also known as: CRI, colour rendering index, color rendering index. Category: Lighting and optics.

The colour rendering index (CRI) rates how faithfully a light source reproduces the colours of objects compared with a reference source, on a scale up to 100. Lights for product photography should have a high CRI, typically 95 or more, so colours in images match the real product.

## How PhotoRobot uses it

LED lights documented for PhotoRobot systems list CRI values of 95 to 96. PhotoRobot notes that LED lighting with a low CRI leaves gaps in the colour spectrum, which later image editing or generation tools cannot recover.

## See on photorobot.com

- [FOMEI LED ROLL specifications](https://www.photorobot.com/manuals/fomei-led-roll)

## Related terms

- [Colour temperature](https://www.photorobot.com/glossary/colour-temperature): The warmth or coolness of white light, measured in kelvin (K); daylight is about 5500–5600 K.
- [Continuous light](https://www.photorobot.com/glossary/continuous-light): Lighting that stays on constantly, typically LED, so the effect is visible before shooting.
- [White balance](https://www.photorobot.com/glossary/white-balance): Adjusting an image so neutral whites and greys show no colour cast under the given light.

## Where this term appears on photorobot.com

Mentioned on 3 pages. Most relevant:

- [FOMEI LED ROLL - PhotoRobot User and Controls Guide](https://www.photorobot.com/manuals/fomei-led-roll): …Temperature 5600K Voltage AC 15V / 5A, DC 14.4V Dimensions 61 x 46 x 0.3cm Weight 0.5kg CRI 95 LED Diodes 504 pcs LED ROLL 100 DMX Specifications.
- [FOMEI LED DMX 150B Studio Light - PhotoRobot User Guide](https://www.photorobot.com/manuals/fomei-led-dmx-150b): Specifications LEDS 1x COB LED chip Wattage 150W CCT 5600K Dimming 0 - 100% Beam Angle 30° CRI 96 LUX 5600K: 0.5m 109000 / 1m 18400 / 2m 4280 / 3m 1900 Voltage AC 220 - 240V Dimensions 420 x 185 x…
- [Using AI to Enhance Product Photo Backgrounds](https://www.photorobot.com/blog/enhancing-product-photo-backgrounds): For example, using LED lighting with low CRI produces photos where part of the color spectrum is missing.