To define light source color properties, the lighting industry predominantly relies on two metrics, correlated color temperature (CCT), commonly used as an indication of the apparent "warmth" or "coolness" of the light emitted by a source, and color rendering index (CRI), an indication of the light source’s ability to make objects appear natural.
Try to answer this question if possible (otherwise reply "unanswerable"): What metric indicates "warmth" or "coolness"?
CCT