What Is This Tool?
This converter helps you transform luminous intensity measurements from the Carcel unit, a 19th-century standard based on a colza oil lamp, into the Candle (pentane) unit, an earlier photometric measure derived from a pentane-fueled flame. It supports historical research and comparison of early lighting standards.
How to Use This Tool?
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Enter the numerical value in Carcel units to convert
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Select the unit to convert from (Carcel unit)
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Choose the unit to convert to (Candle (pentane))
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Click the convert button to receive the equivalent value
Key Features
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Converts luminous intensity values from Carcel units to Candle (pentane)
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Based on historical photometric definitions for accurate translation
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Browser-based and easy to use without installation
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Supports studies and documentation of antique lighting measures
Examples
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1 Carcel unit equals 9.61 Candle (pentane)
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5 Carcel units equal 48.05 Candle (pentane)
Common Use Cases
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Translating historic luminous intensity values between early photometric units
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Supporting conservation and calibration of period-accurate lighting in museums
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Interpreting 19th- and early 20th-century measurements and lamp specifications
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Educational demonstrations on the history and development of light measurement
Tips & Best Practices
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Use this tool mainly for historical and educational purposes
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Consider the approximate nature of conversions due to varying original definitions
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Cross-check converted values when documenting lighting in museums or archives
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Understand both units are obsolete and relate to early lighting standards
Limitations
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Both Carcel and Candle (pentane) are outdated and not aligned with modern SI units
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Definitions depend on historical apparatus and conditions, leading to approximate results
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Conversions are intended mainly for historical research, education, and archival studies
Frequently Asked Questions
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What is the Carcel unit?
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The Carcel unit is a historical measure of luminous intensity based on a standardized oil lamp burning colza oil, used primarily in the 19th century for early photometry.
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How is the Candle (pentane) unit defined?
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Candle (pentane) is an old non-SI luminous intensity unit defined by the light from a pentane-fueled flame, used historically before the adoption of the candela.
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Why should I convert Carcel units to Candle (pentane)?
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Converting helps interpret and compare early photometric data, which is valuable for historical research, museum conservation, and educational purposes.
Key Terminology
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Carcel unit
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A 19th-century luminous intensity unit based on the light from a standardized oil lamp burning colza oil under specified conditions.
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Candle (pentane)
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A historical non-SI unit of luminous intensity based on the light from a pentane-fueled flame, used in early photometry before the candela.
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Luminous intensity
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A measure of the wavelength-weighted power emitted by a light source in a particular direction, perceived by the human eye.