What Is This Tool?
This tool converts illumination measurements from lux, the modern SI unit, to the obsolete centimeter-candle unit. It is designed to help users interpret current lighting data in terms of older, candle-based illuminance units often found in historical or legacy documentation.
How to Use This Tool?
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Enter the illuminance value measured in lux in the input field
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Select 'lux [lx]' as the source unit and 'centimeter-candle [cm*c]' as the target unit
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Click the convert button to get the equivalent value in centimeter-candle
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Review and interpret the converted result for historical or comparative analysis
Key Features
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Converts illuminance units from lux (lx) to centimeter-candle (cm*c)
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Suitable for historical photometry and legacy lighting data analysis
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Browser-based and easy to use without requiring installation
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Supports understanding of obsolete candle-based illumination units
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Useful for comparing contemporary and older lighting measurements
Examples
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500 lux converts to 0.05 centimeter-candle
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10,000 lux equals 1 centimeter-candle
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Use the tool to convert any lux value to centimeter-candle using the formula: 1 lux = 0.0001 centimeter-candle
Common Use Cases
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Converting modern illuminance readings to compare with older candle-based lighting data
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Supporting historical lighting research and restoration involving legacy units
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Analyzing photographic and optical device lighting using obsolete specifications
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Calibrating instruments based on older photometric standards
Tips & Best Practices
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Understand the context of the original candle standard as it may affect numerical equivalence
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Use lux as the preferred measurement unit for consistency and compliance
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Apply the conversion mainly for comparative or historical purposes rather than precise modern measurements
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Ensure idealized point source assumptions apply when interpreting converted values
Limitations
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Centimeter-candle is an outdated unit with minimal use in current practical applications
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Conversion depends on historical candle standards that may vary
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Lux is internationally recognized and preferred for accuracy and standardization
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Conversions assume ideal point source geometry which might not reflect real-life lighting
Frequently Asked Questions
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Why convert lux to centimeter-candle?
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Converting lux to centimeter-candle helps relate modern measurements to obsolete candle-based units used in historical lighting data and older standards.
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Is centimeter-candle still used today?
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No, centimeter-candle is an obsolete unit replaced by the SI unit lux, and it is mostly relevant for interpreting legacy lighting information.
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How precise is this conversion?
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The conversion provides a numerical relation based on idealized assumptions, but historical candle definitions and actual lighting conditions may affect precision.
Key Terminology
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Lux [lx]
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The SI derived unit of illuminance representing luminous flux per square metre, weighted by human photopic visual response.
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Centimeter-candle [cm*c]
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An obsolete illuminance unit denoting the illumination on a surface one centimetre from a one candle point source, historically used in photometry.
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Illuminance
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A measurement of the amount of luminous flux incident per unit area on a surface.