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| − | {{stub}}
| + | =Definition= |
| − | | + | =Examples= |
| − | = Color Rendering Index =
| + | [[Image:trend-graph-calm-technology.png|left|300px]] |
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| − | == Definition ==
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| − | The Color Rendering Index (CRI) is a quantitative measure of a light source's ability to reveal the colors of objects faithfully in comparison with an ideal or natural light source. It is expressed on a scale from 0 to 100, where 100 represents the most accurate color rendering. CRI is critical in lighting design, photography, art, and various industries where color accuracy is essential.
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| − | Key characteristics of CRI include:
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| − | * Measures how well a light source displays the colors of an object compared to a reference light source
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| − | * Calculated by comparing the color of objects under the test light source to their color under an ideal light source
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| − | * Ranges from 0 to 100, with higher numbers indicating better color rendering
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| − | == Technical Overview ==
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| − | The CRI is determined by measuring the color shift of eight standard color samples when illuminated by the test light source compared to a reference source (typically sunlight or an incandescent lamp). These color samples represent different hues and saturations:
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| − | * Ra: The general color rendering index calculated from the first eight color samples
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| − | * Extended CRI (Ra16): Includes additional color samples for more comprehensive analysis
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| − | == Examples ==
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| − | Different light sources have varying CRI values:
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| − | * Incandescent bulbs: Nearly 100 CRI (excellent color rendering)
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| − | * Fluorescent lights: Typically 50-80 CRI (moderate color rendering)
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| − | * LED lights: Can range from 70 to 95+ CRI (depending on the specific type)
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| − | * Sodium vapor lamps: Very low CRI (around 20-30)
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| − | [[Image:low-cri-light-calm-technology.png|left|300px]] | + | |
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| − | [[Image:high-cri-light-calm-technology.png|left|300px]]
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| − | | + | =References= |
| − | == Practical Applications ==
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| − | CRI is crucial in various fields:
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| − | * Art galleries and museums
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| − | * Photography and film lighting
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| − | * Architectural and interior design
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| − | * Medical and scientific laboratories
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| − | * Retail display lighting
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| − | == Limitations ==
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| − | While CRI is widely used, it has some limitations:
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| − | * Does not account for the full spectrum of color perception
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| − | * Does not measure color temperature or spectral distribution
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| − | * May not perfectly represent how humans perceive color in all conditions
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| − | == References ==
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| − | # International Commission on Illumination (CIE) publications
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| − | # Lighting research publications
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| − | # Manufacturer specifications for light sources
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| − | # https://www.ies.org/definitions/color-rendering-index-cri-of-a-light-source/
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| − | [[Category:Light]]
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| | __NOTOC__ | | __NOTOC__ |
