The color rendering index (CRI) is measured as a number between 0 and 100. At zero (0), all colors look the same. A CRI of 100 shows the true colors of the object. Under a low CRI LED, colors might appear distorted, washed out, or indistinguishable.
Typically, light sources with a CRI of 80 to 90 are regarded as good and those with a CRI of 90+ are excellent!
"The general rule is: The higher the CRI, the better the color rendering capacity."