Why is the wavelength 555 nm important in this conversion?

555 nm corresponds to the photopic peak of human visual sensitivity, aligning radiometric measurements with how the human eye perceives light.

What is a stilb and where is it used?

A stilb is a CGS photometric unit of luminance equal to 10,000 candela per square meter, often used historically to describe light source brightness and surface luminance.

Can I use this tool for wavelengths other than 555 nm?

This conversion assumes measurements at exactly 555 nm; using it for other wavelengths may lead to inaccuracies.

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

Learn how to convert luminance units from watt per square centimeter per steradian at 555 nm wavelength to stilb, a CGS photometric unit, using this straightforward online unit converter.

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

Stilb [sb]

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

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

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

Explore More Luminance Units Converter

What Is This Tool?

This unit converter helps you translate luminance values measured in watt per square centimeter per steradian at 555 nm, a radiometric spectral radiance unit, into stilb, an older CGS photometric luminance unit. It assists in comparing radiometric measurements aligned with human visual sensitivity to traditional photometric scales.

How to Use This Tool?

Enter the luminance value in watt per square centimeter per steradian (at 555 nm)
Select the input unit as watt/sq. cm/steradian at 555 nm
Choose stilb [sb] as the target output unit
Execute the conversion to get the equivalent luminance in stilb
Use the result to compare or translate photometric measurements accordingly

Key Features

Converts luminance from watt/sq. cm/steradian (at 555 nm) to stilb [sb]
Based on precise spectral measurement at the photopic peak (555 nm)
Relates modern radiometric units to historic CGS luminance units
Supports optical metrology and vision science research needs
Facilitates interpretation of legacy photometric data

Examples

2 watt/sq. cm/steradian (at 555 nm) equals 1366 stilb [sb]
0.5 watt/sq. cm/steradian (at 555 nm) equals 341.5 stilb [sb]

Common Use Cases

Characterizing spectral radiance of light sources or displays at the photopic peak
Converting radiometric radiance to photometric luminance using human eye sensitivity at 555 nm
Specifying or comparing LED and lamp outputs in optical metrology and photometric testing
Interpreting historical photometric data reported in CGS units
Describing luminance of bright laboratory sources or reflective surfaces in older research

Tips & Best Practices

Ensure the spectral measurement is exactly at 555 nm for accurate conversion
Use this conversion when relating radiometric quantities to legacy photometric units
Be aware that stilb is a CGS unit; further conversion may be needed for SI unit alignment
Apply the tool in contexts matching the defined wavelength and measurement conditions
Cross-check converted results when comparing with modern photometric values

Limitations

Accuracy depends on measurement being precisely at 555 nm wavelength
Stilb is an older CGS unit; most current work uses candela per square meter (cd/m²)
Conversion applicability is limited when spectral power distribution varies significantly
Measurement geometry differences may cause errors if not accounted for
Further unit conversions might be necessary for contemporary photometric applications

Frequently Asked Questions

Why is the wavelength 555 nm important in this conversion?: 555 nm corresponds to the photopic peak of human visual sensitivity, aligning radiometric measurements with how the human eye perceives light.
What is a stilb and where is it used?: A stilb is a CGS photometric unit of luminance equal to 10,000 candela per square meter, often used historically to describe light source brightness and surface luminance.
Can I use this tool for wavelengths other than 555 nm?: This conversion assumes measurements at exactly 555 nm; using it for other wavelengths may lead to inaccuracies.

Key Terminology

Watt/sq. cm/steradian (at 555 nm): A radiometric spectral radiance unit measuring radiant power per unit projected area and solid angle at 555 nm wavelength.
Stilb [sb]: A CGS photometric luminance unit equal to 10,000 candela per square meter used to quantify luminous intensity per unit area.
Photopic Peak: The wavelength near 555 nm where the human eye's sensitivity to light is maximal under well-lit conditions.

Quick Knowledge Check

What does 1 watt/sq. cm/steradian (at 555 nm) convert to in stilb?

683 stilb

1000 stilb

10 stilb

Why is 555 nm wavelength used in this unit conversion?

It is the photopic peak of human vision

It is the infrared peak

It is a standard ultraviolet wavelength

What is the stilb unit primarily used for?

Measuring luminance in CGS system

Measuring illuminance in SI system

Measuring radiance in watts

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