What Is This Tool?
This converter assists in changing luminous intensity values from the candle (pentane) unit, based on pentane-fueled flame light, to the German candle unit, a historical measure used in German-speaking regions. It aids in understanding and comparing old lighting data.
How to Use This Tool?
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Enter the luminous intensity value measured in candle (pentane).
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Select candle (pentane) as the source unit and candle (German) [c (German)] as the target unit.
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Click the convert button to receive the equivalent value in German candles.
Key Features
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Facilitates conversion between two obsolete luminous intensity units used historically.
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Supports accurate interpretation of vintage photometric and lamp specifications.
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Browser-based and straightforward interface for quick unit conversion.
Examples
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5 candle (pentane) equals 4.75 candle (German) [c (German)]
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10 candle (pentane) equals 9.5 candle (German) [c (German)]
Common Use Cases
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Analyzing and comparing early 19th to early 20th-century photometric data recorded with different luminous intensity standards.
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Calibrating and reproducing historic lighting conditions for museums or restoration projects.
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Educational exploration of the history and evolution of lighting measurement units.
Tips & Best Practices
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Always verify the historical context and original measurement standards when interpreting converted values.
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Use this tool primarily for research, conservation, and educational purposes.
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Cross-reference converted data with modern candela values if greater precision is required.
Limitations
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Both units are outdated and non-SI, with definitions that depended on specific historical apparatus.
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Conversion accuracy may be affected by inconsistencies in original measurements.
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Not intended for modern technical applications requiring standard SI units.
Frequently Asked Questions
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What is candle (pentane)?
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It is a historic luminous intensity unit based on the light from a standardized pentane-fuel flame used in early photometry and lamp testing.
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How does candle (German) differ from candle (pentane)?
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The candle (German) is an obsolete unit used in German-speaking countries, based on a standardized flame, measuring luminous intensity in a direction, differing slightly in definition and value from candle (pentane).
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Why do I need to convert between these two units?
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Conversion helps interpret and compare old lighting measurements recorded with different historical standards, which is important for restoration, museum work, or historical research.
Key Terminology
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Candle (pentane)
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A historical luminous intensity unit based on light emitted by a standardized pentane-fueled flame, used in early photometry.
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Candle (German) [c (German)]
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An obsolete German luminous intensity unit based on a standardized flame, historically used before adoption of 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.