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

It measures radiometric spectral radiance, quantifying radiant power per unit projected area and solid angle at the wavelength of 555 nm.

Why is skot no longer used in modern luminance measurements?

Skot is an obsolete, non-SI unit that was replaced by standardized SI units such as candela per square meter to ensure consistency in luminance measurements.

When should I convert watt/sq. cm/steradian (at 555 nm) to skot?

Conversions are useful when working with legacy low-light data or historical photometry literature involving scotopic vision conditions.

How to Convert from Watt/sq. cm/steradian (at 555 nm) to Skot

Learn how to convert luminance units from watt/sq. cm/steradian (at 555 nm) to the obsolete photometric unit skot, with detailed explanations, examples, and common use cases relevant to vision research and photometry.

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

Skot

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Watt/sq. cm/steradian (at 555 nm) to Skot Conversion Table

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

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Watt/sq. cm/steradian (at 555 nm) to Skot Conversion Table
Watt/sq. cm/steradian (at 555 nm)	Skot

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What Is This Tool?

This unit converter transforms luminance values measured in watt/sq. cm/steradian at 555 nm, a radiometric spectral radiance unit, into skot, a historical photometric unit for very low luminance levels related to scotopic vision.

How to Use This Tool?

Enter the luminance value in watt/sq. cm/steradian (at 555 nm).
Choose skot as the target unit for conversion.
View the converted value based on the provided formula and conversion rate.

Key Features

Converts radiometric spectral radiance at 555 nm to the non-SI skot unit.
Supports interpretation of low-light luminance data from legacy photometric studies.
Facilitates calibration and comparison of modern and historical luminance measurements.
Includes conversion formulas and example calculations.

Examples

0.5 watt/sq. cm/steradian (at 555 nm) converts to approximately 1.0728539 × 10¹⁰ skot.
0.1 watt/sq. cm/steradian (at 555 nm) converts to about 2.1457078 × 10⁹ skot.

Common Use Cases

Characterizing spectral radiance of small-area light sources and displays at 555 nm for vision research.
Comparing radiometric radiance data at 555 nm with historical photometric low-light measurements in skot.
Calibrating sensors or interpreting legacy low-luminance data in optical metrology and photometry.
Specifying LED, lamp, or optical system output at the photopic peak wavelength for scientific testing.

Tips & Best Practices

Ensure your source measurements correspond to the 555 nm wavelength for accurate relevance.
Use this conversion primarily for interpreting or comparing legacy data involving scotopic vision conditions.
Be aware that skot is obsolete and has been replaced by SI luminance units in modern applications.
Consider the differences between photopic and scotopic vision when applying conversions.

Limitations

Skot is an outdated, non-SI unit not used in contemporary luminance measurement.
The conversion assumes a specific spectral sensitivity peak at 555 nm, which may not represent all conditions.
Comparisons across different lighting states or instruments not standardized at 555 nm may yield less reliable results.

Frequently Asked Questions

What does watt/sq. cm/steradian (at 555 nm) measure?: It measures radiometric spectral radiance, quantifying radiant power per unit projected area and solid angle at the wavelength of 555 nm.
Why is skot no longer used in modern luminance measurements?: Skot is an obsolete, non-SI unit that was replaced by standardized SI units such as candela per square meter to ensure consistency in luminance measurements.
When should I convert watt/sq. cm/steradian (at 555 nm) to skot?: Conversions are useful when working with legacy low-light data or historical photometry literature involving scotopic vision conditions.

Key Terminology

Watt/sq. cm/steradian (at 555 nm): A radiometric unit measuring radiant power per projected unit area per solid angle at 555 nm wavelength, aligned with human photopic vision sensitivity.
Skot: An obsolete photometric unit formerly used to quantify very low luminance levels under scotopic vision, replaced by SI units in modern practice.
Photopic peak: The wavelength around 555 nm corresponding to peak human visual sensitivity under well-lit conditions.

Quick Knowledge Check

What is the unit watt/sq. cm/steradian (at 555 nm) primarily used to measure?

Photometric luminance under scotopic conditions

Radiometric spectral radiance at the photopic peak wavelength

Electrical power consumption of light sources

Why is the skot unit considered obsolete?

It was never officially recognized

It has been replaced by SI luminance units like candela per square meter

It measures a different physical quantity than luminance

When is it particularly relevant to convert from watt/sq. cm/steradian to skot?

When calibrating modern electrical appliances

When interpreting or comparing legacy low-luminance data involving scotopic vision

When measuring color temperature of light sources

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