What does the CRI value mean?

An identical light temperature does not automatically imply the same light. Colour rendering of any light source depends on the composition of the light, in other words, on the colour of the light. To assess these values, the Colour Rendering Index (Ra or CRI) is introduced: Indexing the brightness of a light source.

• So what does the value of a CRI mean?
CRI 100 (100%) is the highest possible score; all colours are rendered optimally. A lower CRI value indicates that the colours are displayed less clearly. This is because with a lower lower CRI, the colours are made duller than they originally are. For example, a CRI of >80 means the following: after the entire service life of the product, only 80% of the light source has the same light composition as when it was new.