Color Rendering Index - Typical Values

Typical Values

Light source CCT (K) CRI
Low-pressure sodium (LPS/SOX) 1800 ~5
Clear mercury-vapor 6410 17
High-pressure sodium (HPS/SON) 2100 24
Coated mercury-vapor 3600 49
Halophosphate warm-white fluorescent 2940 51
Halophosphate cool-white fluorescent 4230 64
Tri-phosphor warm-white fluorescent 2940 73
Halophosphate cool-daylight fluorescent 6430 76
"White" SON 2700 82
Quartz metal halide 4200 85
Tri-phosphor cool-white fluorescent 4080 89
Ceramic metal halide 5400 96
Incandescent/halogen bulb 3200 100

A reference source, such as blackbody radiation, is defined as having a CRI of 100. This is why incandescent lamps have that rating, as they are, in effect, almost blackbody radiators. The best possible faithfulness to a reference is specified by a CRI of one hundred, while the very poorest is specified by a CRI below zero. A high CRI by itself does not imply a good rendition of color, because the reference itself may have an imbalanced SPD if it has an extreme color temperature.

Read more about this topic:  Color Rendering Index

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