What Is This Tool?
This converter transforms luminous intensity measurements from lumen per steradian [lm/sr] to the bougie decimal, a historical French unit of luminous intensity that is numerically equal to lumen per steradian. It facilitates interpreting older lighting standards and photometric data.
How to Use This Tool?
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Input the luminous intensity value in lumen per steradian [lm/sr]
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Select the source unit as lumen/steradian [lm/sr]
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Choose the target unit as bougie decimal
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Click the convert button to see the equivalent value
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Use the result for research, restoration, or educational purposes
Key Features
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Converts luminous intensity values between lm/sr and bougie decimal seamlessly
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Equivalence-based conversion maintaining unit value accuracy
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Browser-based tool requiring no installation or configuration
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Supports users working with 19th and early 20th-century photometric data
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Helps bridge modern and historical lighting measurement systems
Examples
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5 lumen/steradian [lm/sr] converts to 5 bougie decimal
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0.75 lumen/steradian [lm/sr] converts to 0.75 bougie decimal
Common Use Cases
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Decoding luminous intensity values in historical French lighting specifications
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Converting old photometric measurements to modern standards for archival work
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Supporting restoration projects involving period lighting equipment
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Teaching photometry history and unit evolution in academic settings
Tips & Best Practices
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Confirm the historical context before converting luminous intensity data
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Use this tool primarily for educational and archival research purposes
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Avoid applying the bougie decimal unit in modern photometric measurements
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Cross-reference conversions with original documentation when possible
Limitations
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Bougie decimal is obsolete and not used in contemporary photometry
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Conversion assumes numerical equivalence but reflects no modern industry standards
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Tool is designed for historical and archival applications only
Frequently Asked Questions
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What is lumen per steradian [lm/sr]?
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Lumen per steradian measures luminous intensity as the visible light power emitted per unit solid angle, equal to the SI candela.
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What does bougie decimal mean?
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The bougie decimal is an obsolete French luminous intensity unit historically used as a decimal-based candle measure.
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Can this converter be used for modern lighting design?
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No, the bougie decimal is obsolete and relevant only for historical, archival, or educational research.
Key Terminology
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Lumen per steradian [lm/sr]
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A unit of luminous intensity measuring visible light power per unit solid angle; equivalent to candela.
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Bougie decimal
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An outdated French unit of luminous intensity used historically as a decimal-based candle measure.
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Luminous intensity
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The amount of visible light emitted from a source in a particular direction per unit solid angle.