What Is This Tool?
This tool converts luminous intensity measurements from the decimal candle, a historical European unit, to the candle (UK), an obsolete British unit. Both units were used in the 19th and early 20th centuries for photometric standards before being replaced by the candela.
How to Use This Tool?
-
Enter the luminous intensity value measured in decimal candles.
-
Select decimal candle as the source unit and candle (UK) as the target unit if prompted.
-
Click the convert button to obtain the equivalent value in candle (UK) units.
-
Review the converted value for use in historical lighting interpretation or documentation.
Key Features
-
Converts decimal candle values to candle (UK) units based on established historical conversion rates.
-
Facilitates accurate comparison of luminous intensity data from 19th-century European and British standards.
-
Useful for restoration, research, and analysis involving historical lighting measurements.
-
Browser-based and easy to use with simple input and output fields.
Examples
-
Convert 5 decimal candles to candle (UK): 5 × 0.96 = 4.8 candle (UK).
-
Convert 10 decimal candles to candle (UK): 10 × 0.96 = 9.6 candle (UK).
Common Use Cases
-
Interpreting and converting historical luminous intensity measurements from 19th-century photometric standards.
-
Restoring original lighting conditions in museums, historic buildings, and theatre reconstructions.
-
Analyzing and comparing archival lighting data from old British and European sources.
-
Converting early photometric data to modern units for historical research or academic study.
Tips & Best Practices
-
Ensure the input values are sourced from historical records specifying decimal candle units.
-
Use the converted results primarily for historical or research purposes rather than modern lighting design.
-
Consider the inherent variability in historical candle manufacture and conditions when interpreting results.
-
Cross-reference converted data with modern candela values for broader contextual understanding.
Limitations
-
Both decimal candle and candle (UK) are obsolete units replaced by the candela, so values are not fully aligned with current standards.
-
Historical differences in candle materials and burn rates may cause slight measurement inconsistencies.
-
Conversion accuracy is best suited for historical or academic use, not for contemporary lighting applications.
Frequently Asked Questions
-
What is a decimal candle?
-
A decimal candle is a historical luminous intensity unit defined by the light produced by a standardized candle in the 19th century, used before the modern candela was established.
-
Why convert decimal candles to candle (UK)?
-
Converting decimal candles to candle (UK) allows accurate comparison and interpretation of historical British and European luminous intensity measurements.
-
Can this conversion be used for modern lighting design?
-
No, both units are obsolete and primarily relevant to historical research, restoration, and archival work rather than current lighting applications.
Key Terminology
-
Decimal Candle
-
A historical luminous intensity unit defined by the light emitted from a standardized candle in 19th-century Europe, replaced by the candela.
-
Candle (UK) [c (UK)]
-
An obsolete British unit of luminous intensity based on a standard candle used in UK photometric practice before modern units.
-
Luminous Intensity
-
A measure of the wavelength-weighted power emitted by a light source in a particular direction, typically measured in candela.