What does lumen/square foot/steradian measure?

It quantifies the amount of visible light emitted, reflected, or transmitted by a surface in a given direction, expressed in lumens per square foot per steradian.

What is a foot-lambert?

A foot-lambert is an imperial unit of luminance measuring luminous intensity emitted or reflected from a surface per unit projected area.

Why convert between lumen/square foot/steradian and foot-lambert?

Conversion helps translate luminance into an imperial unit often used for screen brightness, display calibration, and lighting assessments using customary units.

How to Convert from Lumen/square foot/steradian to Foot-lambert [fL]

Learn how to easily convert luminance values from lumen per square foot per steradian to the foot-lambert (fL) unit using this straightforward online conversion tool, ideal for lighting, signage, and display applications.

Lumen/square foot/steradian

Foot-lambert [fL]

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Lumen/square foot/steradian to Foot-lambert [fL] Conversion Table

Lumen/square foot/steradian	Foot-lambert [fL]

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

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Lumen/square foot/steradian to Foot-lambert [fL] Conversion Table
Lumen/square foot/steradian	Foot-lambert [fL]

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What Is This Tool?

This converter helps transform luminance measurements from lumen per square foot per steradian, a non-SI unit quantifying visible light emitted or reflected per area and direction, into the foot-lambert (fL), an imperial luminance unit commonly used for assessing screen brightness and reflected light.

How to Use This Tool?

Enter the luminance value in lumen per square foot per steradian in the input field.
Select the conversion option to foot-lambert [fL].
Click convert to obtain the equivalent value in foot-lamberts.
Review the result and use it for your lighting, signage, or display project needs.

Key Features

Converts between lumen/square foot/steradian and foot-lambert units accurately using defined conversion rates.
Supports use cases in lighting design, signage brightness evaluation, and screen calibration.
Provides quick and browser-based calculations for practical measurement translation.
Includes example conversions for ease of understanding.
Aligns luminance data with imperial measurement standards used in theaters, architecture, and display calibration.

Examples

2 lumen/square foot/steradian equals 6.2831853072 foot-lambert [fL].
0.5 lumen/square foot/steradian equals 1.5707963268 foot-lambert [fL].

Common Use Cases

Measuring brightness for signs, billboards, and large outdoor displays using U.S. customary units.
Architectural and lighting design projects involving glare control and visual comfort assessments in foot-based units.
Calibrating and reporting luminance data from photometers or luminance meters with non-SI units.
Specifying screen brightness for cinema and home-theater calibration.
Design and evaluation of theater projection systems and display screen calibration.

Tips & Best Practices

Ensure input values are measured accurately using calibrated instruments for best results.
Confirm unit consistency when reporting luminance in imperial system units.
Use this converter to align your luminance data with customary units in your field.
Review example conversions to understand how values translate across units.
Apply conversions carefully considering ambient conditions and instrument calibration.

Limitations

Conversion accuracy depends on adherence to imperial unit definitions and calibrated measurement tools.
Environmental factors and measurement instrument variability may affect practical comparability of luminance values.
This tool does not account for variations outside the defined conversion rate.

Frequently Asked Questions

What does lumen/square foot/steradian measure?: It quantifies the amount of visible light emitted, reflected, or transmitted by a surface in a given direction, expressed in lumens per square foot per steradian.
What is a foot-lambert?: A foot-lambert is an imperial unit of luminance measuring luminous intensity emitted or reflected from a surface per unit projected area.
Why convert between lumen/square foot/steradian and foot-lambert?: Conversion helps translate luminance into an imperial unit often used for screen brightness, display calibration, and lighting assessments using customary units.

Key Terminology

Lumen/square foot/steradian: A non-SI unit of luminance measuring luminous flux per square foot per steradian, equivalent to candelas per square foot.
Foot-lambert [fL]: An imperial luminance unit defining luminous intensity per projected area, equal to 1/π candela per square foot.
Luminance: The measure of visible light emitted, reflected, or transmitted by a surface in a specific direction.

Quick Knowledge Check

What unit does lumen/square foot/steradian correspond to?

Luminous flux per steradian

Luminous flux per unit area per unit solid angle

Luminous intensity per square meter

Foot-lambert is mainly used to measure what?

Area brightness in metric units

Luminous intensity per projected area in imperial units

Light wavelength in theaters

When is converting to foot-lambert beneficial?

For architectural plans using metric units

For cinema and home-theater screen brightness calibration

For international SI-based measurements

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