What is the skot unit used for?

Skot was historically used to quantify very low luminance levels under dark-adapted (scotopic) vision but is no longer used in modern photometry.

Why convert skot to watt/sq. cm/steradian at 555 nm?

Converting skot to this radiometric unit allows integration of legacy low-light luminance data with modern photometric and optical measurement standards.

Are the conversion values precise for scotopic vision?

The conversion assumes a wavelength of 555 nm for photopic vision, so it may not perfectly represent scotopic luminance conditions where skot was originally defined.

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

Convert luminance values from the obsolete skot unit to watt per square centimeter per steradian at 555 nm. Use this tool to interpret legacy low-light data in modern radiometric terms.

Skot

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

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

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

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

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.

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

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What Is This Tool?

This online converter helps you transform luminance values measured in skot, a deprecated photometric unit for very low light levels under scotopic vision, into watt per square centimeter per steradian at the 555 nm wavelength. It allows for integrating historical low-light luminance data with modern photometric and radiometric units.

How to Use This Tool?

Enter the luminance value in skot you want to convert
Select the conversion target unit as watt/sq. cm/steradian (at 555 nm)
Submit the input to calculate the equivalent spectral radiance value
Review the output to relate historical photometric data to modern radiometric units

Key Features

Converts from the non-SI skot unit to a precise radiometric spectral radiance measure at 555 nm
Facilitates calibration and comparison of legacy low-light luminance values with current standards
Provides clear output in watts per square centimeter per steradian (at 555 nm) for optical measurements
Supports use cases in vision research, photometric calibration, and optical metrology

Examples

Convert 5 Skot: 5 × 4.6604668548139e-11 = 2.33023342740695e-10 Watt/sq. cm/steradian (at 555 nm)
Convert 0.1 Skot: 0.1 × 4.6604668548139e-11 = 4.6604668548139e-12 Watt/sq. cm/steradian (at 555 nm)

Common Use Cases

Translating legacy night-time or low-luminance data into modern units for comparison and analysis
Calibrating sensors and instrumentation by converting historical photometric measurements
Characterizing spectral radiance of optical sources at the photopic sensitivity peak for research
Testing LEDs, lamps, or optical systems specifically at 555 nm using consistent radiometric units

Tips & Best Practices

Use the converter to understand and relate older scotopic luminance values to present-day radiometric standards
Verify the wavelength assumption of 555 nm aligns with your application's photopic measurement needs
Be aware that extremely low converted values may require highly sensitive instruments for detection
Consult historical context when interpreting skot values, as the unit is obsolete and non-SI compliant

Limitations

Skot is an outdated unit and not officially recognized in current SI measurement systems
Conversion results assume measurements at 555 nm, which corresponds to photopic rather than scotopic vision
Converted values are often extremely low and may be difficult to measure practically without specialized equipment

Frequently Asked Questions

What is the skot unit used for?: Skot was historically used to quantify very low luminance levels under dark-adapted (scotopic) vision but is no longer used in modern photometry.
Why convert skot to watt/sq. cm/steradian at 555 nm?: Converting skot to this radiometric unit allows integration of legacy low-light luminance data with modern photometric and optical measurement standards.
Are the conversion values precise for scotopic vision?: The conversion assumes a wavelength of 555 nm for photopic vision, so it may not perfectly represent scotopic luminance conditions where skot was originally defined.

Key Terminology

Skot: An outdated photometric unit formerly used for measuring extremely low luminance levels under scotopic vision conditions.
Watt/sq. cm/steradian (at 555 nm): A radiometric spectral radiance measurement indicating radiant power per area per solid angle at 555 nm wavelength.
Scotopic vision: Vision under very low light levels where rod cells in the eye are primarily active.
Photopic vision: Vision under bright light conditions, dominated by cone cell response and peaking sensitivity near 555 nm.

Quick Knowledge Check

What kind of luminance does the skot unit describe?

High-intensity daylight luminance

Very low scintillating light levels

Low luminance under scotopic vision

What wavelength is referenced in the target conversion unit?

555 nm

450 nm

600 nm

Which of these is a limitation of converting skot to watt/sq. cm/steradian (at 555 nm)?

Conversion assumes photopic peak wavelength

Skot is an SI-approved unit

All converted values are easy to measure

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