What does lumen/square foot/steradian measure?

It measures luminance as luminous flux per unit area per unit solid angle, quantifying visible light emitted or reflected by a surface in a particular direction.

Where is the lambert unit commonly applied?

Lambert is used in optical engineering, photographic contexts, cinema projection, and converting older CGS photometric data.

Are these units SI standardized?

No, both lumen/square foot/steradian and lambert are non-SI units, which may limit usage where international standard units are required.

How to Convert from Lumen/square foot/steradian to Lambert [L]

Q: Why convert from lumen/square foot/steradian to lambert?

To translate luminance values from U.S. customary units to lambert for comparison and use in optical or photographic contexts that historically utilize lambert.

Convert luminance values from lumen per square foot per steradian to lambert [L] using this guide. Understand unit definitions, use cases, conversion steps, and examples for accurate luminance unit translation.

Lumen/square foot/steradian

Lambert [L]

Please check your input. It must be a valid numeric value.

Lumen/square foot/steradian to Lambert [L] Conversion Table

Lumen/square foot/steradian	Lambert [L]

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 Lambert [L] Conversion Table
Lumen/square foot/steradian	Lambert [L]

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What Is This Tool?

This tool enables conversion between two non-SI luminance units: lumen per square foot per steradian and lambert [L]. It helps users transform brightness measurements from U.S. customary foot-based units to the CGS-based lambert unit, commonly used in optical and photographic applications.

How to Use This Tool?

Enter the luminance value in lumen per square foot per steradian
Select the source unit as lumen/square foot/steradian
Choose lambert [L] as the target unit
Click convert to obtain the equivalent luminance value in lamberts
Review examples if needed to understand the conversion

Key Features

Converts luminance values between lumen/square foot/steradian and lambert [L]
Provides a clear conversion rate based on established definitions
Includes practical examples demonstrating the conversion process
Supports use in architectural, optical, photographic, and cinematic contexts
Browser-based and simple to use without requiring additional tools

Examples

10 lumen/square foot/steradian equals 0.033815822 lambert [L]
50 lumen/square foot/steradian equals 0.16907911 lambert [L]

Common Use Cases

Measuring brightness of outdoor signs and billboards using foot-based units
Architectural lighting design focusing on glare control and visual comfort
Calibration of photometers reporting luminance values in U.S. customary units
Optical engineering and photographic work involving surface brightness
Cinema projection assessments historically using lambert and foot-lambert units
Converting legacy photometric data in CGS units for modern analysis

Tips & Best Practices

Ensure correct input of value and units before conversion
Be mindful of the unit systems since they differ (U.S. customary vs. CGS)
Use the tool for historical and niche applications where lambert is relevant
Consider converting results to SI units like candela per square meter for wider use
Review conversion examples to confirm understanding of the process

Limitations

Both units are not part of the International System of Units (SI) and may lack global standardization
Users must carefully consider the differences in area and solid angle bases across unit systems
Lambert is largely historical and niche, with modern practices favoring SI luminance units
Conversion accuracy relies on using the exact given conversion rate without assumptions

Frequently Asked Questions

What does lumen/square foot/steradian measure?: It measures luminance as luminous flux per unit area per unit solid angle, quantifying visible light emitted or reflected by a surface in a particular direction.
Where is the lambert unit commonly applied?: Lambert is used in optical engineering, photographic contexts, cinema projection, and converting older CGS photometric data.
Why convert from lumen/square foot/steradian to lambert?: To translate luminance values from U.S. customary units to lambert for comparison and use in optical or photographic contexts that historically utilize lambert.
Are these units SI standardized?: No, both lumen/square foot/steradian and lambert are non-SI units, which may limit usage where international standard units are required.

Key Terminology

Lumen/square foot/steradian: A unit measuring luminance as luminous flux per square foot per steradian, equivalent to candelas per square foot.
Lambert [L]: A non-SI CGS unit of luminance defined as 1/π candela per square centimetre, used for self-luminous or diffusely reflecting surfaces.
Luminance: The measure of visible light intensity emitted, reflected, or transmitted by a surface in a given direction.

Quick Knowledge Check

What type of quantity do lumen/square foot/steradian and lambert measure?

Volume

Luminance

Temperature

Which unit system does lambert belong to?

SI unit system

CGS unit system

Imperial unit system

What is a common use of lumen/square foot/steradian?

Assessing sound intensity in outdoor events

Measuring brightness of billboards and signs

Calculating weight of architectural materials

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