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How to Convert from Decimal Candle to Lumen/steradian [lm/sr]
Learn how to convert luminous intensity measurements from the historical unit decimal candle to the modern unit lumen per steradian (lm/sr), which is equivalent to the candela in SI units.
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Decimal candle to Lumen/steradian [lm/sr] Conversion Table
| Decimal 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.
| Decimal candle | Lumen/steradian [lm/sr] |
|---|
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What Is This Tool?
This unit converter translates luminous intensity values measured in decimal candles, a 19th-century unit, into lumen per steradian (lm/sr), the modern SI-compatible unit equivalent to the candela.
How to Use This Tool?
- Enter the luminous intensity value in decimal candles.
- Select decimal candle as the input unit and lumen/steradian [lm/sr] as the output unit.
- Execute the conversion to obtain the equivalent luminous intensity in lumen/steradian.
- Use the converted result to relate historical measurements with modern standards.
Key Features
- Supports conversion between the historical luminous intensity unit decimal candle and lumen/steradian.
- Facilitates comparison between old photometric data and current standards.
- Uses a direct 1:1 conversion rate for accurate, straightforward calculations.
- Ideal for lighting engineering, metrology, and historical lighting research.
Examples
- 5 decimal candles equals 5 lumen/steradian [lm/sr].
- 0.75 decimal candle converts to 0.75 lumen/steradian [lm/sr].
Common Use Cases
- Translating 19th-century luminous intensity measurements for academic and historical analysis.
- Calibrating early photometric instruments based on candle brightness standards.
- Comparing directional brightness of LEDs, lamps, and vehicle headlights using lumen/steradian.
- Performing photometric testing for streetlights and stage lighting.
Tips & Best Practices
- Refer to historical context when interpreting decimal candle values due to their obsolete nature.
- Use this converter to bridge older lighting data with modern SI unit standards seamlessly.
- Confirm environmental and measurement conditions when comparing luminous intensity results.
- Leverage photometric instrument calibration for precise lighting distribution measurements.
Limitations
- Decimal candle is no longer in use and may lack precision compared to current units.
- Lumen/steradian assumes ideal angular measurement which might not fully match real-world conditions.
- Conversion presumes consistent brightness conditions despite variability in original candle materials and environments.
Frequently Asked Questions
- What is a decimal candle?
- A decimal candle is a historical unit of luminous intensity based on the light from a standardized candle used in the 19th century, now replaced by the candela.
- Is lumen per steradian the same as candela?
- Yes, 1 lumen per steradian (lm/sr) is numerically equal to the SI unit candela and measures luminous intensity.
- Why convert decimal candles to lumen/steradian?
- Conversion helps relate outdated luminous intensity measurements to modern standards for comparison and instrument calibration.
Key Terminology
- Decimal Candle
- A historical luminous intensity unit defined by the light from a standardized candle used in 19th-century photometry.
- Lumen/steradian [lm/sr]
- A measure of luminous intensity equal to one candela, indicating luminous flux emitted per unit solid angle.
- Luminous Intensity
- The amount of visible light power emitted in a particular direction, weighted by human eye sensitivity.