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How to Convert from Apostilb to Lumen/square foot/steradian
Learn how to convert luminance measurements from the historical apostilb unit to lumen per square foot per steradian, a non-SI customary unit used in lighting and photometry applications.
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Apostilb to Lumen/square foot/steradian Conversion Table
| Apostilb | Lumen/square foot/steradian |
|---|
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.
| Apostilb | Lumen/square foot/steradian |
|---|
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What Is This Tool?
This converter transforms luminance values measured in apostilbs into lumen per square foot per steradian, facilitating conversions between a historical metric-related unit and a U.S. customary luminance unit commonly used in lighting design and signage brightness assessments.
How to Use This Tool?
- Enter the luminance value in apostilbs you want to convert.
- Select apostilb as the source unit and lumen/square foot/steradian as the target unit.
- Click the convert button to get the equivalent luminance in lumen/square foot/steradian.
Key Features
- Converts luminance units from apostilb to lumen/square foot/steradian accurately.
- Supports conversion for applications in photometry, cinematography, and lighting engineering.
- Provides a browser-based, user-friendly interface for easy unit conversion.
Examples
- 5 Apostilb converts to 0.1478597805 Lumen/square foot/steradian.
- 10 Apostilb converts to 0.295719561 Lumen/square foot/steradian.
Common Use Cases
- Translating historical or metric luminance data for use in U.S. customary unit contexts.
- Assessing brightness of signs, billboards, and large outdoor displays measured in customary units.
- Performing architectural lighting design and glare control using foot-based area units.
- Calibrating and reporting luminance measurements on devices that provide readings in non-SI units.
Tips & Best Practices
- Verify the units you start with and want to convert to for accurate results.
- Use this tool when working with historical data or customary measurement contexts.
- Consider the limitations of each unit system when interpreting results and making design decisions.
Limitations
- Apostilb is a non-SI and mostly historical unit, which might not be recognized in current metrology standards.
- Conversion depends on an exact factor involving π, and measurement differences can influence accuracy.
- Lumen/square foot/steradian is a customary unit, restricting use in regions standardized on SI units.
Frequently Asked Questions
- What is an apostilb unit used for?
- The apostilb measures luminance historically in photometry and cinematography and is used for reporting screen brightness or the luminance of diffusely reflecting surfaces.
- Why convert apostilb to lumen/square foot/steradian?
- Conversion is useful to translate metric-based or historical luminance data into U.S. customary units common in signage brightness assessment and lighting designs using foot-based measurements.
- Is lumen/square foot/steradian an SI unit?
- No, lumen per square foot per steradian is a non-SI unit expressing luminance with U.S. customary area units.
Key Terminology
- Apostilb
- A historical, non-SI unit of luminance equal to 1/π candela per square metre, measuring luminous intensity emitted or reflected per unit area in a given direction.
- Lumen/square foot/steradian
- A non-SI luminance unit expressing visible light per unit area per unit solid angle, used primarily in U.S. customary measurement contexts.
- Luminance
- A measure of luminous intensity per unit area of light-emitting or reflecting surfaces in a specified direction.