"I found a lamp, which is to irradiate food. The color places of the Board differ from the Planck's curve. Is there a CRi for this Board at all? Or is waived when a deviation from the Planck's curve on a CRI? "If you could shed light on this subject would be great :)"
The colour rendering index or CRI (color rendering index) can you determine in principle for each light, whether on the Planck's spotlight or not.
The reduced loop marked in the color triangle exactly the color places of light of the Sun.
If the light source far from the Planck's spotlight is located, the CRI is bad then just according to.
Different color places used for food lighting depending on the location. The chromaticity coordinate "Fresh meat" is as far away from the Planck's curve, "Baked goods" even closer.

Also the CRI for "Bakery products lighting" is quite high, because for the CRI (color rendering index), red tones play an important role. R9 (red) is the most important value.
Did the light in the dark? = D
Best regards, Miriam Döhner