CRI is a measure of a light source's ability to accurately portray the color of an object, material, or skin tone on which it is shining. CRI ranges from 0 to 100, with the sun representing the baseline CRI value of 100%.

CRI 100Excellent
All colors clearly separatable
CRI 80Good
Some colors look the same
CRI 70Poor
Can't distinguish most colors

CRI is determined with a test procedure using eight color samples. The light is compared to a control light and the average differences measured are subtracted from 100.

The smaller the average difference, the higher the CRI.

Ultimately the higher the CRI the more pure the light source.

The Takeaway?

80 CRI is great for indoor lighting and 70+ CRI works for a warehouse or industrial facility.