What Is This Tool?
This converter allows you to change luminous intensity measurements from candle (pentane), a historical unit based on a pentane flame, to bougie decimal, an obsolete French luminous intensity unit. Both units were used before the adoption of the candela as the standard SI unit and hold historical and archival importance.
How to Use This Tool?
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Enter the luminous intensity value in candle (pentane)
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Select candle (pentane) as the source unit and bougie decimal as the target unit
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Initiate the conversion to get the equivalent value in bougie decimal
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Use the result for historical research, museum lighting restoration, or educational purposes
Key Features
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Converts luminous intensity from candle (pentane) to bougie decimal with a 1:1 rate
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Designed for historical and archival research involving obsolete photometric units
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Supports restoration and conservation work requiring period-accurate lighting values
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Browser-based and easy to use without requiring special software
Examples
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5 candle (pentane) converts to 5 bougie decimal
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12 candle (pentane) converts to 12 bougie decimal
Common Use Cases
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Interpreting 19th and early 20th-century photometric data referencing the pentane candle standard
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Converting French historical luminous intensity values from bougie decimal for archival research
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Calibrating lighting levels for antique lamp conservation and museum displays
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Teaching and learning about the evolution of light measurement standards
Tips & Best Practices
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Use this conversion primarily for historical and archival contexts rather than precise scientific measurements
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Be aware that both units are obsolete and based on flame light sources subject to variability
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Cross-reference conversion results with historical documentation when possible
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Apply this tool for educational demonstrations on photometry history and standards development
Limitations
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Both candle (pentane) and bougie decimal are obsolete units no longer standardized by modern SI
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Light emission from flame sources can vary, causing uncertainties in exact equivalences
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Conversions should be used cautiously and not for high-precision scientific or engineering purposes
Frequently Asked Questions
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What is the relationship between candle (pentane) and bougie decimal?
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The conversion is direct and one-to-one: 1 candle (pentane) equals 1 bougie decimal.
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Why are these units considered obsolete?
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Both units were based on flame sources and have been replaced by the candela, the modern SI unit for luminous intensity.
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Can I use this conversion for precise scientific work?
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No, because these units are not standardized in the modern SI system and their light output can vary, conversions are best suited for historical and archival purposes.
Key Terminology
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Candle (pentane)
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A historical luminous intensity unit based on the light of a standardized pentane-fuel flame, used in early photometry before the adoption of the candela.
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Bougie decimal
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An obsolete French unit of luminous intensity used in the 19th and early 20th centuries as a decimal-based candle measurement, replaced by the SI 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.