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| | =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__ |
