What is a foot-lambert used for?

Foot-lambert is used to specify and measure projected-screen brightness and reflected luminance in cinema and home-theater calibration, as well as for display calibration in imperial units.

How is lumen/sq. meter/steradian related to candela per square meter?

Lumen per square meter per steradian is equivalent to the SI unit candela per square meter and quantifies how bright a surface appears in a given direction.

Why convert foot-lambert to lumen/sq. meter/steradian?

Converting foot-lambert to lumen/sq. meter/steradian helps standardize luminance measurements between imperial and SI units, aiding in accurate brightness comparison and photometric assessments.

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

Convert luminance values between foot-lambert (fL), an imperial unit used in cinema and display calibration, and lumen per square meter per steradian, an SI photometric unit used for brightness measurement.

Foot-lambert [fL]

Lumen/sq. meter/steradian

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

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

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

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

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What Is This Tool?

This converter transforms luminance measurements from foot-lambert (fL), an imperial unit used primarily for screen brightness and projection system evaluations, into lumen per square meter per steradian, the SI equivalent commonly used in photometry and visual ergonomics.

How to Use This Tool?

Enter the luminance value in foot-lambert in the input field
Select foot-lambert as the starting unit and lumen/sq. meter/steradian as the target unit
Click the convert button to get the equivalent luminance value
Use the result for accurate brightness comparisons and design calculations

Key Features

Converts luminance values from foot-lambert to lumen/sq. meter/steradian accurately
Supports usage in cinema, home theater, display calibration, and lighting design
Browser-based and easy to use with simple input and output
Provides essential unit definitions and contextual relevance

Examples

Convert 2 foot-lambert to lumen/sq. meter/steradian: 2 × 3.4262590996 = 6.8525181992 lm/m²/sr
Convert 0.5 foot-lambert to lumen/sq. meter/steradian: 0.5 × 3.4262590996 = 1.7131295498 lm/m²/sr

Common Use Cases

Specifying projected screen brightness for cinema and home theater calibration
Designing and testing reflected luminance for theater and projection systems
Calibrating and comparing display brightness when specifications use imperial units
Ensuring appropriate brightness and visual comfort for lighting and signage
Setting optical instrument exposure and performing photometric evaluations

Tips & Best Practices

Confirm the measurement unit before conversion to ensure accuracy
Use the converter to unify measurement units across different standards
Consider surface properties and angle of measurement when interpreting results
Keep in mind imperial unit approximations may slightly affect precision
Apply the converted values in design and calibration for reliable brightness assessment

Limitations

Foot-lambert uses an approximate factor related to 1/π, which may introduce minor inaccuracies
Measurements can be influenced by reflectance, viewing angle, and surface characteristics beyond unit conversion
Scientific applications may prefer direct SI unit measurement for highest precision

Frequently Asked Questions

What is a foot-lambert used for?: Foot-lambert is used to specify and measure projected-screen brightness and reflected luminance in cinema and home-theater calibration, as well as for display calibration in imperial units.
How is lumen/sq. meter/steradian related to candela per square meter?: Lumen per square meter per steradian is equivalent to the SI unit candela per square meter and quantifies how bright a surface appears in a given direction.
Why convert foot-lambert to lumen/sq. meter/steradian?: Converting foot-lambert to lumen/sq. meter/steradian helps standardize luminance measurements between imperial and SI units, aiding in accurate brightness comparison and photometric assessments.

Key Terminology

Foot-lambert [fL]: An imperial unit of luminance measuring luminous intensity emitted or reflected from a surface per unit projected area in a given direction; one foot-lambert equals 1/π candela per square foot.
Lumen/sq. meter/steradian: An SI unit of luminance that measures luminous intensity emitted, reflected, or transmitted from a surface per unit area per unit solid angle, equivalent to candela per square meter.
Luminance: The measurement of luminous intensity per unit projected area in a specific direction, describing how bright a surface appears.

Quick Knowledge Check

What does one foot-lambert approximately equal in lumen/sq. meter/steradian?

1.0 lumen/sq. meter/steradian

3.4262590996 lumen/sq. meter/steradian

10 lumen/sq. meter/steradian

In which field is foot-lambert commonly used?

Automotive engineering

Cinema and home theater calibration

Medical imaging

What unit is equivalent to lumen per square meter per steradian?

Candela per square meter

Foot-candle

Lux

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