Lamp CRI refers to the Color Rendering Index (CRI) of a lamp, a measure of its ability to accurately reproduce the colors of objects compared to a natural light source like sunlight.
In more detail:
The Color Rendering Index (CRI) is a single number between 0 and 100. It indicates how well a light source renders the colors of objects in comparison to a reference light source, such as sunlight or incandescent light.
- A CRI of 100 means the light source renders colors identically to the reference source, showing colors most accurately.
- A CRI of 90 or higher is generally considered excellent, suitable for applications where accurate color rendering is critical, such as art galleries, retail spaces showcasing merchandise, and medical examination rooms.
- A CRI of 80 to 90 is considered good and is acceptable for most general lighting applications, like homes and offices.
- A CRI below 80 may distort colors significantly and is typically used in applications where color accuracy is less important, such as street lighting or warehouses.
Here's a table summarizing the CRI ranges and their typical applications:
| CRI Range | Color Rendering Quality | Typical Applications |
|---|---|---|
| 90-100 | Excellent | Art galleries, retail (high-end), medical exams |
| 80-89 | Good | Homes, offices, general retail |
| 70-79 | Acceptable | Warehouses, factories, some outdoor areas |
| Below 70 | Poor | Street lighting, industrial applications where color is not critical |
It's important to note that CRI is not a perfect metric and has limitations. It primarily assesses color rendering based on a limited set of test colors. Other metrics, such as TM-30, provide a more comprehensive evaluation of color rendering properties. However, CRI remains a widely used and understood specification in the lighting industry. When choosing a lamp, consider the application and the importance of accurate color representation to determine the appropriate CRI value.
