> - Poor CRI and SSRI So having a minimum CRI of 80-90 is a good starting point, there are issues with the CRI measure itself: > Ra is the average value of R1

> - Poor CRI and SSRI So having a minimum CRI of 80-90 is a good starting point, there are issues with the CRI measure itself: > Ra is the average value of R1–R8; other values from R9 to R15 are not used in the calculation of Ra, including R9 "saturated red", R13 "skin color (light)", and R15 "skin color (medium)", which are all difficult colors to faithfully reproduce. R9 is a vital index in high-CRI lighting, as many applications require red lights, such as film and video lighting, medical lighting, art lighting, etc. However, in the general CRI (Ra) calculation R9 is not included. * https://en.wikipedia.org/wiki/Color_rendering_index#Special_value:_R9 https://en.wikipedia.org/wiki/Color_rendering_index#Special_... * https://en.wikipedia.org/wiki/Color_rendering_index#Criticism https://en.wikipedia.org/wiki/Color_rendering_index#Criticis... There are initiatives to come up with a better metric, but there doesn't seem to be much traction: * https://en.wikipedia.org/wiki/Color_quality_scale https://en.wikipedia.org/wiki/Color_quality_scale