In the past few years of development, LED technology has grown tremendously and is used by more and more people in the market. However, past standards have limited the possibility of measuring LED light sources. To determine a good light source environment, other factors must be considered. This factor is the color gamut area index (GAI).

The Gamut Area Index (GAI), according to the NLPIP International Survey, is the most useful color indicator. It is commonly used in Japan and North America. In recent years, Asia has also begun to pay attention to this index. The gamut area index of the light source is the area of ​​the polygon that is connected by the coordinate points generated by the eight standard colors of R1 to R8 of CRI in CIE1976.

GAI standard range for each color gamut area in CIE 1976

The figure below shows the coverage area of ​​the Excellent Area Area Index (GAI) by lighting the passport. The larger the area covered, the higher the value of GAI.

The gamut area index (GAI) is higher, with better color discrimination and color saturation or vivid color performance. The GAI may exceed 100, but usually indicates that the color is oversaturated. In general, architects, lighting engineers, industrial designers and stage lighting designers recommend a light source with a CRI of more than CRI85 and a GAI index of between 80 and 100.

The calculation range of the gamut area: the blue area is the GAI standard reference, and the red area is the measured gamut area.

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