Why is 555 nm wavelength important in this conversion?

555 nm represents the photopic peak of human visual sensitivity, making it a standard reference for relating radiometric measurements to photometric luminance.

What does millilambert measure?

Millilambert quantifies luminance, representing luminous intensity emitted or reflected per surface area into a unit solid angle, commonly used in imaging and cinematography.

Is millilambert an SI unit?

No, millilambert is a non-SI unit derived from the lambert, which is largely obsolete but still encountered in certain optical and imaging fields.

How to Convert from Watt/sq. cm/steradian (at 555 nm) to Millilambert [mL]

Learn how to convert luminance values from watt per square centimeter per steradian at 555 nm wavelength to millilambert units for applications in imaging, cinematography, and optical measurement.

Watt/sq. cm/steradian (at 555 nm)

Millilambert [mL]

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Watt/sq. cm/steradian (at 555 nm) to Millilambert [mL] Conversion Table

Watt/sq. cm/steradian (at 555 nm)	Millilambert [mL]

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Start Value

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Watt/sq. cm/steradian (at 555 nm) to Millilambert [mL] Conversion Table
Watt/sq. cm/steradian (at 555 nm)	Millilambert [mL]

Explore More Luminance Units Converter

What Is This Tool?

This converter transforms luminance measurements given in watt per square centimeter per steradian at 555 nm—a radiometric spectral radiance unit—into millilambert, a non-SI photometric unit suited for describing surface brightness in various imaging and display contexts.

How to Use This Tool?

Enter the luminance value in watt/sq. cm/steradian at 555 nm
Select millilambert [mL] as the target unit
Click convert to get the equivalent luminance in millilambert

Key Features

Converts radiometric spectral radiance at 555 nm to photometric luminance units
Supports measurement comparison and calibration in vision research and optical metrology
Facilitates unit translations common in cinematography, broadcast engineering, and imaging labs

Examples

Convert 0.5 watt/sq. cm/steradian (at 555 nm) to millilambert: 0.5 × 2145707.7824018 = 1072853.89 mL
Convert 2 watt/sq. cm/steradian (at 555 nm) to millilambert: 2 × 2145707.7824018 = 4291415.56 mL

Common Use Cases

Analyzing spectral radiance of small-area light sources or displays at the photopic vision peak
Calibrating instruments by converting radiometric radiance to photometric luminance units
Specifying LED, lamp, or optical system output for metrology and photometric testing
Describing luminance in cinematography, broadcast engineering, and photographic imaging environments

Tips & Best Practices

Ensure input measurements are taken at 555 nm wavelength to match photopic sensitivity
Use this conversion to relate radiometric measurements to photometric values relevant to human vision
Be cautious interpreting millilambert values due to their non-SI and partly obsolete status
Apply luminous efficiency functions appropriately for accurate calibration results

Limitations

Unit measurement is specific to wavelength 555 nm and assumes photopic vision sensitivity
Millilambert is a non-SI, largely outdated unit that requires careful integration with SI units
Accuracy depends on precise spectral radiance measurements and correct luminous efficiency application

Frequently Asked Questions

Why is 555 nm wavelength important in this conversion?: 555 nm represents the photopic peak of human visual sensitivity, making it a standard reference for relating radiometric measurements to photometric luminance.
What does millilambert measure?: Millilambert quantifies luminance, representing luminous intensity emitted or reflected per surface area into a unit solid angle, commonly used in imaging and cinematography.
Is millilambert an SI unit?: No, millilambert is a non-SI unit derived from the lambert, which is largely obsolete but still encountered in certain optical and imaging fields.

Key Terminology

Watt/sq. cm/steradian (at 555 nm): A radiometric spectral radiance unit expressing radiant power per unit projected area and unit solid angle specifically at the 555 nm wavelength.
Millilambert [mL]: A non-SI photometric luminance unit equal to one thousandth of a lambert, representing luminous intensity per unit area per unit solid angle.
Photopic Peak: The wavelength near 555 nm where human visual sensitivity under well-lit conditions is highest.

Quick Knowledge Check

What does watt/sq. cm/steradian (at 555 nm) measure?

Photometric luminance

Radiometric spectral radiance

Luminous intensity

Which unit is millilambert related to?

Candela per square metre

Lambert

Watt per steradian

Why might millilambert require careful interpretation?

Because it is tied to a non-visual wavelength

Because it is a non-SI, partly obsolete unit

Because it cannot be converted to SI units

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