Gamut area index (GAI) is a good indicator of color saturation. A light source with high GAI shows good color discrimination, saturation, and vividness. Choosing a source with high CRI (85 or greater) and a high GAI (80-100) is better. However, GAI higher than 100 might be saturated.
The calculations of Gamut Area,
the blue area means standard reference,
and the red area means the measured value.