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How to Convert from Hefner candle to Lumen/steradian [lm/sr]
Learn how to convert luminous intensity values from the historic hefner candle to the modern lumen per steradian (lm/sr) unit, used widely in lighting research and calibration.
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Hefner candle to Lumen/steradian [lm/sr] Conversion Table
| Hefner candle | Lumen/steradian [lm/sr] |
|---|
Custom Unit Conversion Table Generator – Instant Printable Conversion Tables
Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.
Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.
Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.
| Hefner candle | Lumen/steradian [lm/sr] |
|---|
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What Is This Tool?
This converter helps you translate luminous intensity measurements from the obsolete unit hefner candle, historically used in German-speaking countries, into lumen per steradian [lm/sr], a unit equivalent to the candela and widely used in modern photometry.
How to Use This Tool?
- Enter the value in hefner candles you want to convert.
- Select hefner candle as the input unit and lumen/steradian as the output unit.
- Click convert to get the corresponding luminous intensity in lm/sr.
Key Features
- Converts historical hefner candle values to modern luminous intensity units (lm/sr).
- Supports lighting research, conservation, and calibration needs.
- Based on a fixed conversion ratio standardized from original lamp conditions.
Examples
- 5 hefner candles equals approximately 4.5 lumen/steradian [lm/sr].
- 10 hefner candles equals approximately 9.0 lumen/steradian [lm/sr].
Common Use Cases
- Converting historical lighting specifications from late 19th and early 20th century Germany and Austria.
- Restoring and calibrating antique photometric instruments and museum exhibits.
- Comparing legacy photometric data with modern measurements in lighting research.
Tips & Best Practices
- Ensure original Hefner lamp conditions are considered when interpreting conversions.
- Use this tool to support archival work and historical data comparison with modern SI units.
- Complement conversions with calibration procedures when restoring vintage lighting devices.
Limitations
- The hefner candle is an obsolete unit dependent on standardized historical lamp conditions.
- Modern photometric practices primarily use candela or lumen/steradian units.
- Interpreting legacy data requires caution due to possible variations in original measurement methods.
Frequently Asked Questions
- What is a hefner candle?
- The hefner candle is a former unit of luminous intensity defined by a standardized lamp burning amyl acetate, used historically in German-speaking regions.
- How does lumen per steradian relate to candela?
- One lumen per steradian is numerically equal to one candela, both measuring luminous intensity per unit solid angle.
- Why convert from hefner candle to lumen/steradian?
- Converting allows translating historical lighting data into modern SI-based units for accurate comparison and research.
Key Terminology
- Hefner candle
- An obsolete luminous intensity unit defined by the light emitted from a standardized Hefner lamp burning amyl acetate.
- Lumen per steradian [lm/sr]
- A unit of luminous intensity measuring luminous flux per unit solid angle, equal to the candela.
- Luminous intensity
- The measure of the perceived power of light emitted in a particular direction.