What is a millilambert?

A millilambert (mL) is a non-SI unit of luminance equal to one thousandth of a lambert, describing luminous intensity per unit area and solid angle.

Is millilambert still commonly used?

Millilambert is largely obsolete but still appears in cinematography, broadcast engineering, and some imaging applications.

What does lumen per square foot per steradian measure?

It measures the luminous flux emitted or reflected per unit area and solid angle, quantifying brightness in customary units.

Convert Millilambert [mL] to Lumen/square foot/steradian Easily

Q: Why convert millilambert to lumen/square foot/steradian?

Converting helps translate legacy luminance measurements into U.S. customary units commonly used in signage, lighting design, and photometric instrument calibration.

Quickly convert luminance values from millilambert (mL) to lumen per square foot per steradian using this simple online unit converter for lighting and display measurements.

Millilambert [mL]

Lumen/square foot/steradian

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Millilambert [mL] to Lumen/square foot/steradian Conversion Table

Millilambert [mL]	Lumen/square foot/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

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.

Millilambert [mL] to Lumen/square foot/steradian Conversion Table
Millilambert [mL]	Lumen/square foot/steradian

Explore More Luminance Units Converter

What Is This Tool?

This tool converts luminance measurements from millilambert (mL) to lumen per square foot per steradian. It helps translate legacy or CGS-based luminance values into U.S. customary units commonly used in signage, lighting design, and photometric reporting.

How to Use This Tool?

Enter the luminance value in millilambert (mL).
Select millilambert as the input unit and lumen/square foot/steradian as the output unit.
Click convert to see the result in lumen/square foot/steradian.
Use the conversion for analysis, calibration, or reporting in your project.

Key Features

Converts between non-SI luminance units relevant for cinematography and architectural lighting.
Supports conversion from millilambert to lumen/square foot/steradian using established constants.
Useful for calibrating instruments and comparing different unit systems.
Browser-based and easy to use for quick luminance translations.

Examples

5 millilambert [mL] converts to approximately 1.4786 lumen/square foot/steradian.
10 millilambert [mL] converts to approximately 2.9572 lumen/square foot/steradian.

Common Use Cases

Determining display and projector screen brightness in cinematography and broadcast engineering.
Evaluating luminance of photographic prints, films, and lightboxes in imaging labs.
Assessing brightness of signs, billboards, and large outdoor displays using U.S. customary units.
Performing architectural lighting design for glare control and visual comfort.
Calibrating and reporting luminance from photometers with differing measurement units.

Tips & Best Practices

Ensure clarity when converting between unit systems due to differences in measurement standards.
Verify your input values correspond to the correct source unit (millilambert).
Use this conversion to maintain consistency when combining SI, CGS, and U.S. customary units.
Check calibration of your lighting instruments before relying on converted luminance values.

Limitations

Millilambert is a non-SI and mostly obsolete unit which may cause ambiguity.
Careful handling is needed because of differences between CGS and U.S. customary area units.
Precision depends on the accuracy of conversion constants and measurement devices.
Small rounding discrepancies can arise during the conversion process.

Frequently Asked Questions

What is a millilambert?: A millilambert (mL) is a non-SI unit of luminance equal to one thousandth of a lambert, describing luminous intensity per unit area and solid angle.
Why convert millilambert to lumen/square foot/steradian?: Converting helps translate legacy luminance measurements into U.S. customary units commonly used in signage, lighting design, and photometric instrument calibration.
Is millilambert still commonly used?: Millilambert is largely obsolete but still appears in cinematography, broadcast engineering, and some imaging applications.
What does lumen per square foot per steradian measure?: It measures the luminous flux emitted or reflected per unit area and solid angle, quantifying brightness in customary units.

Key Terminology

Millilambert (mL): A non-SI unit of luminance equal to one thousandth of a lambert, used to quantify luminous intensity per unit area and solid angle.
Lumen/square foot/steradian: A non-SI luminance unit representing luminous flux per square foot per steradian, equivalent to candela per square foot.
Luminance: A measurement of the luminous intensity emitted or reflected from a surface per unit area and solid angle.

Quick Knowledge Check

What is the millilambert (mL) primarily used to measure?

Luminous flux

Luminance

Light wavelength

Which unit is equivalent to lumen per square foot per steradian?

Candela per square foot

Lambert

Candela per square metre

Why might you convert millilambert to lumen/square foot/steradian?

To convert SI units to CGS units

To use U.S. customary units in lighting projects

To measure luminous flux

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