What does foot-lambert measure?

Foot-lambert is an imperial unit of luminance that quantifies luminous intensity emitted or reflected from a surface per unit projected area in a specific direction.

Why convert foot-lambert to lumen per square centimetre per steradian?

Converting to lumen/sq. cm/steradian allows precise characterization of luminous flux per area and solid angle, which is essential for high-brightness or small-area light sources.

Can this conversion be used for any luminance measurement?

This conversion is best suited for applications involving cinema calibration, optical design, and small-area luminance measurements; caution is advised when applying it broadly to large or diffuse luminance sources.

How to Convert from Foot-lambert [fL] to Lumen/sq. cm/steradian?

Learn how to convert luminance values from foot-lambert (fL) to lumen per square centimetre per steradian using this practical unit converter. Understand conversion use cases, examples, and best practices for precise photometric measurements.

Foot-lambert [fL]

Lumen/sq. cm/steradian

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Foot-lambert [fL] to Lumen/sq. cm/steradian Conversion Table

Foot-lambert [fL]	Lumen/sq. cm/steradian

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Start Value

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Foot-lambert [fL] to Lumen/sq. cm/steradian Conversion Table
Foot-lambert [fL]	Lumen/sq. cm/steradian

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What Is This Tool?

This converter transforms luminance measurements from foot-lambert, an imperial unit often used in screen brightness and theater applications, into lumen per square centimetre per steradian, a photometric unit ideal for characterizing luminous flux per area and solid angle, especially in small or high-brightness sources.

How to Use This Tool?

Enter the luminance value measured in foot-lamberts (fL).
Select foot-lambert as the input unit and lumen/sq. cm/steradian as the output unit.
Click the convert button to obtain the result in lumen per square centimetre per steradian.
Use the converted value for precise photometric analysis or calibration tasks.

Key Features

Convert luminance from foot-lambert (fL) to lumen/sq. cm/steradian accurately.
Supports units commonly used in cinema calibration, optical design, and display testing.
Browser-based and easy to use without requiring complex inputs.
Includes example conversions for quick reference.
Suitable for applications involving small-area or high-intensity luminance measurements.

Examples

2 foot-lamberts equals 0.0006852518 lumen/sq. cm/steradian.
5 foot-lamberts equals 0.0017131295 lumen/sq. cm/steradian.

Common Use Cases

Specifying and measuring brightness for cinema screens and home-theater systems.
Calibrating displays and projectors using imperial units for luminance.
Designing and testing optical systems, LEDs, and micro-LED emitters requiring fine luminance details.
Calibrating luminance meters and standards for small-area or high-intensity light sources.

Tips & Best Practices

Use this converter to compare luminance values across different measurement systems smoothly.
Always verify the unit context when working between imperial and photometric units.
Apply converted values to enhance calibration accuracy in theaters and advanced display technologies.
Consider the suited measurement area and brightness level when interpreting converted results.

Limitations

Foot-lambert involves approximations based on π and imperial area units, which might reduce precision in strict SI system uses.
Lumen/sq. cm/steradian is optimized for small, high-brightness areas and may not directly correspond to foot-lambert values for large or diffuse sources.
Always interpret results carefully when comparing large-scale luminance measurements using these units.

Frequently Asked Questions

What does foot-lambert measure?: Foot-lambert is an imperial unit of luminance that quantifies luminous intensity emitted or reflected from a surface per unit projected area in a specific direction.
Why convert foot-lambert to lumen per square centimetre per steradian?: Converting to lumen/sq. cm/steradian allows precise characterization of luminous flux per area and solid angle, which is essential for high-brightness or small-area light sources.
Can this conversion be used for any luminance measurement?: This conversion is best suited for applications involving cinema calibration, optical design, and small-area luminance measurements; caution is advised when applying it broadly to large or diffuse luminance sources.

Key Terminology

Foot-lambert [fL]: An imperial unit of luminance quantifying luminous intensity per projected surface area, approximately 3.426259 candela per square meter.
Lumen/sq. cm/steradian: A photometric luminance unit expressing luminous flux per unit area and solid angle, equivalent to candela per square centimetre.
Luminance: A measure of luminous intensity emitted or reflected per unit area in a specific direction.

Quick Knowledge Check

What unit does foot-lambert [fL] quantify?

Luminous flux per unit area

Luminous intensity per projected area in a direction

Solid angle measurement

Lumen/sq. cm/steradian is equivalent to which unit?

Candela per square centimetre

Foot-lambert

Candela per square foot

Which is a common use case for converting foot-lambert to lumen/sq. cm/steradian?

Measuring sound levels in theaters

Calibration of luminance meters for small-area samples

Calculating electrical power consumption

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