What is CRI (Color Rendering Index)? Definition, Table & Recommended Values
CRI (Color Rendering Index, Ra per CIE 013.3:1995) is defined as a quantitative measure, on a scale of 0-100, of a light source's ability to reveal object colors faithfully compared to a reference illuminant of the same correlated color temperature (CCT). A CRI of 100 represents perfect color rendering.
CRI Definition & Standard Reference
Per CIE 013.3:1995, CRI is calculated as the average of eight standard color samples (R1-R8), producing the general color rendering index Ra. The extended CRI (R9-R14) includes saturated colors.
| CRI Range | Classification | Recommended Applications |
|---|---|---|
| CRI 95-100 | Professional Grade | Museums, medical, color-critical manufacturing |
| CRI 90-94 | Premium Commercial | Retail, photography, hospitality |
| CRI 80-89 | Standard Commercial | Offices, schools, warehouses |
| CRI 70-79 | Industrial | High bays, roadway, security |
| Below 70 | Basic Only | Non-color-critical outdoor |
B2B Procurement Recommendation
Recommended minimum CRI for commercial procurement: CRI >= 80 with R9 >= 0 for general office/warehouse. For retail: CRI >= 90 with R9 >= 50. Always request LM-79 test reports.
Conclusion
CRI is defined as a standardized metric per CIE 013.3. Minimum B2B threshold: CRI >= 80 (DLC Standard). Premium: CRI >= 90 + R9 >= 50. Verify with TM-30-20 for critical applications.
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