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How to Convert from Lumen/steradian [lm/sr] to Carcel Unit
Learn how to convert luminous intensity values from lumen per steradian (lm/sr) to the historical carcel unit, bridging modern light measurements with 19th-century lighting standards.
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Lumen/steradian [lm/sr] to Carcel unit Conversion Table
| Lumen/steradian [lm/sr] | Carcel unit |
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Custom Unit Conversion Table Generator – Instant Printable Conversion Tables
Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.
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Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.
| Lumen/steradian [lm/sr] | Carcel unit |
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What Is This Tool?
This converter transforms luminous intensity values measured in lumen per steradian (lm/sr), a modern SI-related unit, into carcel units, a historical standard referencing the light from a typical 19th-century oil lamp. It enables users to relate current photometric data to older lighting systems.
How to Use This Tool?
- Enter the luminous intensity value in lumen per steradian (lm/sr).
- Select 'lumen/steradian' as the source unit and 'carcel unit' as the target unit.
- Click convert to see the corresponding value in carcel units based on the defined conversion factor.
- Use the results to compare with historical lighting performance or scholarly references.
Key Features
- Converts luminous intensity from lumen/steradian to carcel units accurately using known rates.
- Supports comparisons between modern light measurements and historical lamp intensity data.
- Ideal for research in lighting history, museum documentation, and legacy photometric analysis.
- Easy to use, browser-based utility requiring only input values and unit selections.
Examples
- Converting 5 lm/sr results in approximately 0.520291363 carcel units.
- Converting 10 lm/sr results in approximately 1.040582726 carcel units.
Common Use Cases
- Comparing LED or modern lamp brightness with 19th-century oil lamp standards.
- Supporting research in the history of illumination and lighting technology progression.
- Documenting and interpreting lighting conditions in museum or archival exhibits.
- Conducting photometric tests referencing legacy lighting units and regulations.
Tips & Best Practices
- Always verify the source luminous intensity values for accurate conversion.
- Recognize that the carcel unit varies due to historical lamp conditions and fuel types.
- Use the converter as a tool for approximate equivalence rather than precise measurement.
- Combine converted data with historical context to better interpret old lighting standards.
Limitations
- The carcel is an obsolete and non-SI unit with inherent inconsistencies from varying lamp factors.
- It lacks the precision and standardization found in modern SI-based candela measurements.
- Not suitable for scientific or engineering applications requiring strict accuracy.
- Variations in fuel and burner setup historically affect the comparability of carcel values.
Frequently Asked Questions
- What does lumen per steradian measure?
- It measures luminous intensity, representing the visible light power emitted per unit solid angle, and is numerically equal to the candela.
- Why convert lumen/steradian to carcel units?
- To compare modern luminous intensity values with historical lighting data based on the 19th-century Carcel oil lamp standard.
- Is the carcel unit still used in modern lighting measurements?
- No, the carcel is an obsolete unit replaced by SI standards like the candela for accuracy and consistency.
Key Terminology
- Lumen per steradian [lm/sr]
- A measurement of luminous intensity corresponding to luminous flux per unit solid angle, equal in value to the candela.
- Carcel unit
- A historical luminous intensity unit defined by the light emitted from a standard Carcel oil lamp under specific conditions in the 19th century.
- Luminous intensity
- The amount of visible light power emitted by a source in a particular direction per unit solid angle.