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How to Convert from Apostilb to Lumen/sq. meter/steradian
Convert luminance values from the historical apostilb unit to the SI equivalent lumen per square meter per steradian with this handy online tool.
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Apostilb to Lumen/sq. meter/steradian Conversion Table
| Apostilb | Lumen/sq. meter/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/sq. meter/steradian |
|---|
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What Is This Tool?
This tool allows users to convert luminance measurements from the apostilb, a historical non-SI unit, to lumen per square meter per steradian, an SI unit used for expressing brightness of surfaces.
How to Use This Tool?
- Enter the luminance value in apostilbs you wish to convert
- Select apostilb as the input unit and lumen/sq. meter/steradian as the output unit
- Click the convert button to view the corresponding value in lumen/sq. meter/steradian
Key Features
- Converts apostilb to lumen/sq. meter/steradian using a precise conversion factor
- Supports luminance units commonly applied in lighting and display technologies
- Easy-to-use, browser-based interface requiring no installations
Examples
- 2 apostilbs converts to approximately 0.6366197724 lumen/sq. meter/steradian
- 5 apostilbs equals about 1.591549431 lumen/sq. meter/steradian
Common Use Cases
- Translating historical photometric data for modern lighting specifications
- Evaluating screen and display brightness in older cinematography references
- Calibrating imaging devices using legacy luminance units
Tips & Best Practices
- Verify the context of your data to determine if apostilb is the original unit
- Use this conversion when updating or comparing older luminance measurements to SI units
- Apply the tool as a reference for legacy data rather than for new measurements
Limitations
- Apostilb is a non-SI unit and may be incompatible with exclusively SI-calibrated modern instruments
- Conversion involves an approximate factor based on π, which can affect precision
- Primarily suitable for interpreting historical data, not recommended for new luminance readings
Frequently Asked Questions
- What does the apostilb measure?
- The apostilb measures luminance, indicating luminous intensity emitted or reflected from a surface per unit area in a specified direction.
- Why convert apostilb to lumen per square meter per steradian?
- Converting apostilb to lumen/sq. meter/steradian helps translate older photometric data into modern SI units used for display and lighting evaluations.
- Is the apostilb still used in modern measurements?
- The apostilb is mostly a historical unit and is less commonly used in current measurements, which typically rely on SI units.
Key Terminology
- Apostilb
- A non-SI historical luminance unit equal to 1/π candela per square meter, measuring luminous intensity from a surface.
- Lumen per square meter per steradian
- An SI unit of luminance quantifying luminous intensity per unit area and solid angle, equivalent to candela per square meter.