Why use stilb for luminance measurement?

Stilb is a CGS photometric unit used historically for representing luminance, especially in older literature and optical research.

What does the conversion to watt/sq. cm/steradian at 555 nm represent?

It represents the spectral radiance at the photopic peak wavelength, useful for relating radiometric measures to human visual sensitivity.

Can I use this conversion for light sources with varying wavelengths?

The conversion applies specifically at 555 nm and may not be accurate for sources with broadband or different spectral distributions.

How to Convert from Stilb [sb] to Watt/sq. cm/steradian (at 555 nm)?

Learn how to convert luminance units from stilb to watt per square centimeter per steradian at 555 nm using our easy online unit converter. Understand its applications in vision science and optical research.

Stilb [sb]

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

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

Stilb [sb]	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

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Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

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

Explore More Luminance Units Converter

What Is This Tool?

This tool converts luminance values measured in stilb, a CGS photometric unit, to watt per square centimeter per steradian at 555 nm, a radiometric spectral radiance unit aligned with the photopic peak of human vision.

How to Use This Tool?

Enter the luminance value in stilb (sb) units
Select stilb as the input unit
Choose watt/sq. cm/steradian (at 555 nm) as the output unit
Click the convert button to get the result in the desired units

Key Features

Converts luminance from stilb (sb) to watt/sq. cm/steradian at 555 nm
Based on precise known conversion factors
Supports applications in vision science and optical experimentation
Browser-based and easy to use without installation

Examples

2 stilb converts to 0.0029282576 watt/sq. cm/steradian (at 555 nm)
5 stilb converts to 0.007320644 watt/sq. cm/steradian (at 555 nm)

Common Use Cases

Interpreting luminance data in CGS units from older sources
Calibrating instruments for vision research at the photopic peak
Specifying LED and lamp output in optical metrology
Comparing surface brightness values in legacy literature and modern measurements

Tips & Best Practices

Ensure the spectral measurement is centered at 555 nm for accurate conversion
Use this conversion when comparing photometric and radiometric quantities
Apply the tool for instrument calibration involving photopic luminance
Verify source spectral distribution to confirm conversion relevance

Limitations

Conversion is valid only at the wavelength 555 nm, the photopic peak
Not suitable for broadband or other wavelength spectral measurements
Accuracy depends on source spectral characteristics matching 555 nm assumptions

Frequently Asked Questions

Why use stilb for luminance measurement?: Stilb is a CGS photometric unit used historically for representing luminance, especially in older literature and optical research.
What does the conversion to watt/sq. cm/steradian at 555 nm represent?: It represents the spectral radiance at the photopic peak wavelength, useful for relating radiometric measures to human visual sensitivity.
Can I use this conversion for light sources with varying wavelengths?: The conversion applies specifically at 555 nm and may not be accurate for sources with broadband or different spectral distributions.

Key Terminology

Stilb (sb): A CGS photometric unit of luminance equal to 10,000 candela per square metre, indicating luminous intensity per unit area in a certain direction.
Watt/sq. cm/steradian (at 555 nm): A radiometric spectral radiance unit measuring radiant power per unit projected area per unit solid angle at 555 nm wavelength, associated with human visual sensitivity.
Photopic peak: The wavelength near 555 nm where human vision is most sensitive under well-lit conditions.

Quick Knowledge Check

What does the stilb unit measure?

Radiant power per area

Luminance in CGS units

Electrical power output

At which wavelength is the conversion from stilb to watt/sq. cm/steradian valid?

700 nm

555 nm

450 nm

Why is the 555 nm wavelength important for this conversion?

It corresponds to ultraviolet radiation

It aligns with the photopic peak of human vision

It is used for infrared light measurements

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