CRI – Color Rendering Index

The Color Rendering Index (CRI) is a measure of light quality that describes how accurately a light source reproduces the colors of objects compared to natural daylight. The CRI value is expressed on a scale from 0 to 100, with higher values indicating more natural and accurate color rendering.

The higher the CRI value, the more realistically colors are perceived by the human eye. Conversely, low CRI values can cause color distortion, reduced contrast, and make it more difficult to distinguish subtle color differences.

How CRI Is Evaluated

CRI values range from 0 to 100, with natural daylight used as the reference source with a CRI value of 100. The following overview illustrates typical CRI ranges and their common applications:

• CRI < 70 – colors appear dull and significantly distorted; typical for industrial and technical lighting
• CRI 70–80 – colors are acceptable but not fully accurate; common in street and office lighting
• CRI 80–90 – good color rendering; suitable for homes, retail spaces, and general interiors
• CRI ≥ 90 – very accurate color rendering; used in galleries, photography, high-quality flashlights, or detailed work
• CRI ≥ 95 – exceptionally accurate color rendering; typical for laboratory and surgical lighting

Why High CRI Matters

High CRI values are important wherever precise color differentiation is required. This includes fields such as medicine, diagnostics, photography, graphic design, gallery lighting, or evaluating materials and surfaces.

At low CRI levels, colors may appear unnatural — shades of red can blend together, and human skin tones may look pale or distorted. This can make it harder to recognize fine details or interpret colors correctly.

CRI in LED Lighting

In standard LED lighting, the CRI value typically ranges around 80, which is sufficient for general everyday use. However, for activities that require accurate color perception, light sources with CRI values of 90 or higher are more appropriate.

Light sources with a high CRI produce a visually more natural image that closely approximates how colors appear under natural daylight.