Vereinskerze to Carcel Unit Conversion

Comparison Chart of Vereinskerze to Carcel Unit units to understand their conversion accurately.


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Vereinskerze (German Association Candle)

Introduction : The Vereinskerze, or association candle, was another German photometric unit closely aligned with the Berlin candle and outputting approximately 1.11 candela. It played a role in early standardization efforts by scientific societies.

History & Origin : Established by German scientific associations in the 19th century, the Vereinskerze aimed to provide a consistent standard across regions. Its brightness level and technical setup closely mirrored that of the Berlin candle.

Current Use : Applied in academic institutions and engineering offices prior to national standardization, the VK offered a middle ground between traditional and emerging precision-based units. It is now a historical reference only.

Carcel (French Oil Lamp Standard)

Introduction : The Carcel unit was a French standard for luminous intensity, defined by the light produced from a regulated oil lamp. With an output of about 9.61 candela, it served as a reference for photometry in 19th-century France.

History & Origin : Established in 1860 by the French government, the Carcel lamp burned colza oil under controlled conditions. It became a national standard for measuring brightness until replaced by more precise electric light standards and eventually the candela.

Current Use : Used extensively in early photometric studies and lamp manufacturing, the Carcel unit ensured consistent brightness measurements for streetlights, home lamps, and scientific instruments in pre-electric France.

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References

• NIST (US Government)
• Encyclopaedia Britannica