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How to Convert from Foot-lambert [fL] to Lumen/square foot/steradian
Learn how to convert foot-lambert (fL) to lumen per square foot per steradian, essential for luminance measurement in cinema, theater, signage, and architectural lighting using imperial units.
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Foot-lambert [fL] to Lumen/square foot/steradian Conversion Table
| Foot-lambert [fL] | 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.
| Foot-lambert [fL] | Lumen/square foot/steradian |
|---|
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What Is This Tool?
This unit converter enables you to transform luminance values from foot-lambert (fL), an imperial unit measuring luminous intensity per unit projected area in a direction, into lumen per square foot per steradian, a non-SI unit expressing luminous flux per unit area per unit solid angle.
How to Use This Tool?
- Enter the luminance value in foot-lamberts you want to convert.
- Select foot-lambert as the input unit and lumen/square foot/steradian as the output unit.
- Click convert to obtain the equivalent luminance in lumen per square foot per steradian.
Key Features
- Converts luminance from foot-lambert to lumen/square foot/steradian with a precise conversion factor.
- Supports measurements commonly used in cinema, home theater calibration, and theatrical lighting design.
- Facilitates comparisons and calibration of displays and photometric instruments using U.S. customary units.
- Browser-based and easy to use without requiring technical expertise.
Examples
- 5 foot-lamberts converts to 1.591549431 lumen/square foot/steradian.
- 10 foot-lamberts converts to 3.183098862 lumen/square foot/steradian.
Common Use Cases
- Measuring and specifying projected-screen brightness in cinemas and home theaters.
- Performing calibration and testing in theater and projection system design.
- Assessing brightness of signs, billboards, and large outdoor displays using imperial units.
- Conducting architectural lighting design evaluations involving glare control and visual comfort.
- Converting luminance results from photometers or luminance meters reporting in customary units.
Tips & Best Practices
- Use the converter to standardize luminance measurements across devices using imperial units.
- Apply the conversion carefully when comparing units from SI and non-SI systems.
- Consider environmental factors that may affect measurement accuracy beyond unit conversion.
- Verify measurement equipment calibration to improve reliability of results.
Limitations
- Foot-lambert is an imperial unit and not part of the international SI system.
- Conversion precision depends on the approximation of 1/π and instrument accuracy.
- Environmental conditions can cause variability in luminance measurements independent of conversion.
Frequently Asked Questions
- What does one foot-lambert measure?
- One foot-lambert quantifies luminous intensity emitted or reflected per unit projected area in a particular direction.
- Why convert foot-lambert to lumen per square foot per steradian?
- This conversion expresses luminance in terms of luminous flux per area and solid angle, aiding in lighting assessments using imperial units.
- Where is this conversion most commonly applied?
- It is widely used in cinema calibration, theatrical lighting design, outdoor signage brightness, and architectural lighting projects utilizing U.S. customary units.
Key Terminology
- Foot-lambert (fL)
- An imperial luminance unit representing luminous intensity emitted or reflected per unit projected area in a given direction.
- Lumen/square foot/steradian
- A non-SI luminance unit expressing luminous flux per unit area per unit solid angle, equivalent to candelas per square foot.