The same colour temperature does not automatically mean that light is perceived the same way. The colour rendering of a lamp depends on the composition of the light, meaning the colours it contains.

To measure how naturally a lamp displays colours, we use the Color Rendering Index (CRI), also called the Ra value.

• CRI 100 (100%): all colours are rendered perfectly, as close to natural light as possible.

• Lower than 100: colours appear less vivid or slightly distorted.

A high CRI is especially important in spaces where accurate colour perception is essential, such as kitchens, makeup areas, studios, or shops.

Average CRI values by lamp type

Note: Exact CRI values may vary depending on the brand and model. Always check the packaging or technical specifications.

Eye sensitivity and personal colour perception

Everyone perceives light differently. This is called eye sensitivity, the way the human eye perceives colours.

Our eyes contain three types of light-sensitive cells (cones), which are particularly responsive in the yellow part of the spectrum. In this range, our visual acuity is highest, but it varies from person to person.

As a result, a lamp with the same CRI or colour temperature may appear warmer or cooler to one person than another.

Tip: Test lamps in a store or showroom to see which type of light best suits your taste and your space.

Why CRI matters

• A higher CRI provides more natural-looking colours.

• CRI affects mood and productivity: warm light with high CRI is relaxing, while cool light with high CRI can improve concentration.

• In workplaces, shops, and creative spaces, a CRI of 90 or higher is recommended.