What Is This Tool?
This tool converts luminous intensity measurements between the international candle and the German candle, both of which are legacy units that have been superseded by the modern SI candela. It is designed for historical research, archival work, and understanding older photometric data.
How to Use This Tool?
-
Enter the luminous intensity value in candle (international) [c]
-
Select candle (German) [c (German)] as the target unit
-
Click convert to get the equivalent luminous intensity in the German candle
-
Use the resulting value to interpret or compare old lighting standards
Key Features
-
Converts luminous intensity from candle (international) to candle (German)
-
Based on historically defined unit relations used in pre-SI and German standards
-
Useful for interpreting and comparing historical lighting data
-
Supports conversion suitable for restoration and archival documentation
Examples
-
1 Candle (international) [c] = 0.95 Candle (German) [c (German)]
-
10 Candle (international) [c] = 9.5 Candle (German) [c (German)]
Common Use Cases
-
Interpreting luminous intensity in pre-SI and German historical lighting specifications
-
Converting old photometric data for restoration and museum documentation
-
Translating legacy lighting standards into comparable modern units for research
Tips & Best Practices
-
Ensure correct identification of the original units before converting
-
Understand that both units are obsolete and mainly useful in historical contexts
-
Use the conversion results primarily for archival research and documentation
-
Be aware that variations in historic lamp standards may affect exact equivalence
Limitations
-
Both candle units have been replaced by the SI candela and are rarely used in current measurements
-
Variations in historic lamp types and measurement methods impact precision
-
Conversion assumes ideal definitions which may not match all historical cases
Frequently Asked Questions
-
What is the candle (international)?
-
It is an obsolete photometric unit used historically to quantify luminous intensity, representing a standard lamp's intensity prior to the SI candela.
-
Why convert between these two units?
-
Converting allows comparing and interpreting luminous intensity values from older international and German lighting standards in historical research or restoration.
-
Can I use this tool for modern lighting measurements?
-
No, both units are outdated, and modern measurements use the SI candela instead.
Key Terminology
-
Candle (international) [c]
-
An obsolete photometric unit representing luminous intensity based on a standard lamp used before the SI candela.
-
Candle (German) [c (German)]
-
A historic luminous intensity unit used in German-speaking countries, derived from the light of a standardized flame such as the Hefner lamp.
-
Luminous Intensity
-
A measure of the wavelength-weighted power emitted by a light source in a particular direction, perceived by the human eye.