Why is the conversion wavelength-specific to 555 nm?

Because 555 nm corresponds to the peak sensitivity of human photopic vision, making it the standard wavelength for relating radiometric and photometric units.

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

No, the tool is specifically designed for 555 nm and should not be applied directly to other wavelengths without adjustments.

What is the practical use of converting to lumen per square foot per steradian?

This unit is commonly used in the U.S. for specifying brightness in lighting design, billboard measurements, and photometric instrument reports.

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

Learn how to convert luminance measurements from watt per square centimeter per steradian at 555 nm to lumen per square foot per steradian using this online unit converter tool designed for photometric and radiometric applications.

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

Lumen/square foot/steradian

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Watt/sq. cm/steradian (at 555 nm) to Lumen/square foot/steradian Conversion Table

Watt/sq. cm/steradian (at 555 nm)	Lumen/square foot/steradian

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

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Watt/sq. cm/steradian (at 555 nm) to Lumen/square foot/steradian Conversion Table
Watt/sq. cm/steradian (at 555 nm)	Lumen/square foot/steradian

Explore More Luminance Units Converter

What Is This Tool?

This converter transforms luminance values expressed in watt per square centimeter per steradian at 555 nm, a radiometric spectral radiance unit, into lumen per square foot per steradian, a photometric luminance unit commonly used in U.S. customary measurements. It helps bridge radiometric data with photometric units relevant for visual perception and lighting applications.

How to Use This Tool?

Enter the luminance value in watt/sq. cm/steradian (at 555 nm).
Select the output unit as lumen/square foot/steradian.
Submit the conversion request to get the equivalent luminance value.
Use the result for lighting design, photometric reporting, or calibration purposes.

Key Features

Converts spectral radiance at the photopic peak wavelength of 555 nm to customary photometric units.
Supports conversion from watt/sq. cm/steradian (at 555 nm) to lumen/square foot/steradian.
Useful for vision research, optical metrology, and lighting design.
Browser-based and easy to use for quick luminance conversions.
Includes example conversions for practical reference.

Examples

0.5 watt/sq. cm/steradian (at 555 nm) converts to 317263.8816 lumen/square foot/steradian.
2 watt/sq. cm/steradian (at 555 nm) equals 1,269,055.5264 lumen/square foot/steradian.

Common Use Cases

Characterizing spectral radiance of small-area light sources for vision research.
Converting radiometric spectral radiance to photometric luminance reflecting human vision.
Specifying LED and lamp output at 555 nm in optical metrology.
Measuring the brightness of signs and outdoor displays using customary units.
Architectural lighting design assessments involving glare and visual comfort.
Calibrating photometers or luminance meters reporting in non-SI units.

Tips & Best Practices

Always ensure the input value is measured at or converted to the wavelength 555 nm for accuracy.
Use the tool for applications where customary units are required or preferred.
Cross-check conversions when integrating with SI-based systems due to unit differences.
Refer to example values to validate expected results.
Consider the context of human photopic sensitivity when interpreting results.

Limitations

Conversion is valid only at the specific wavelength 555 nm and does not apply to other wavelengths.
Lumen/square foot/steradian is a non-SI unit, which may complicate use with SI-based systems.
Variations in spectral power distributions and luminous efficiency may impact exact equivalence.

Frequently Asked Questions

Why is the conversion wavelength-specific to 555 nm?: Because 555 nm corresponds to the peak sensitivity of human photopic vision, making it the standard wavelength for relating radiometric and photometric units.
Can I use this conversion for wavelengths other than 555 nm?: No, the tool is specifically designed for 555 nm and should not be applied directly to other wavelengths without adjustments.
What is the practical use of converting to lumen per square foot per steradian?: This unit is commonly used in the U.S. for specifying brightness in lighting design, billboard measurements, and photometric instrument reports.

Key Terminology

Watt/sq. cm/steradian (at 555 nm): A radiometric spectral radiance measure representing radiant power per projected area per solid angle at 555 nm wavelength.
Lumen/square foot/steradian: A photometric luminance unit that shows luminous flux emitted or reflected per square foot per steradian, equivalent to candela per square foot.
Photopic Peak: The wavelength near 555 nm where human eye sensitivity to light is highest under well-lit conditions.

Quick Knowledge Check

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

Luminous flux per unit area per unit solid angle

Radiometric spectral radiance at 555 nm

Brightness of LED signs in feet

To convert from watt/sq. cm/steradian to lumen/square foot/steradian, the wavelength must be:

Any visible wavelength

555 nm, the photopic peak

Infrared wavelengths only

Lumen/square foot/steradian is equivalent to which unit?

Candela per square meter

Candela per square foot

Watt per square foot

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