Units & MeasuresGlossary · one of 45 terms
CRI / Ra
RaShort definition
The Color Rendering Index measures how accurately a light shows colors, on a 0–100 scale. Values of 90 and above are considered high quality.
In detail
High CRI lets products, food and skin tones appear in their true colors. CRI ≥ 90 is recommended where color matters — retail, restaurants, museums and homes.
Facts
SymbolRa
CategoryUnits & Measures
Related terms
Guides that use this term
4 guidesWhat Is CRI and Why Does It Matter?Why do two fixtures of the same color temperature render colors differently? The answer lies in CRI. We explain what the Color Rendering Index is and why it matters.1 minColor Temperature Guide: 2700K or 4000K?Warm or cool? Color temperature is one of the most decisive choices for a space's atmosphere. We explain which Kelvin value fits where, step by step.1 minRestaurant & Café Lighting: The Complete GuideA restaurant's atmosphere is built largely with light. From the right color temperature to table lighting — every step of a layout that boosts comfort and sales.1 minStore & Window Lighting: Light That SellsIn retail, light is a marketing tool. From the window that draws customers in to the display light that makes products shine — the rules of sales-driving lighting.1 min
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