Why is the wavelength 555 nm important for this conversion?

Because 555 nm is the photopic peak of human visual sensitivity, this wavelength is used to connect radiometric measurements with perceived brightness in photometric units.

Can this converter be used for broad spectrum light sources?

No, the conversion is designed specifically for spectral radiance at 555 nm and does not apply to broadband or other wavelength measurements.

What is the numeric factor used in this conversion?

The conversion uses a factor of 6,830,000 to translate 1 watt/sq. cm/steradian at 555 nm into lumen/sq. meter/steradian.

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

Learn how to convert luminance measurements from watt per square centimeter per steradian at 555 nm to lumen per square meter per steradian. This guide covers key features, use cases, and step-by-step instructions for accurate conversion in photometric and radiometric applications.

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

Lumen/sq. meter/steradian

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

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

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.

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

Explore More Luminance Units Converter

What Is This Tool?

This online converter transforms luminance values measured in watt per square centimeter per steradian at 555 nm into lumen per square meter per steradian. It is designed to relate radiometric spectral radiance data at the photopic peak wavelength to photometric luminance units that represent human visual brightness.

How to Use This Tool?

Enter the value measured in watt/sq. cm/steradian at 555 nm
Select the 'watt/sq. cm/steradian (at 555 nm)' as the input unit
Select 'lumen/sq. meter/steradian' as the output unit
Click the convert button to see the result
Use the output for interpreting luminance in photometric terms

Key Features

Converts between radiometric and photometric luminance units at 555 nm wavelength
Supports measurements related to human visual sensitivity (photopic peak)
Provides a direct multiplication factor for easy computation
Suitable for optical metrology, lighting design, and photometric testing
Browser-based and user-friendly interface

Examples

0.5 watt/sq. cm/steradian (at 555 nm) equals 3,415,000 lumen/sq. meter/steradian
2 watt/sq. cm/steradian (at 555 nm) equals 13,660,000 lumen/sq. meter/steradian

Common Use Cases

Characterizing spectral radiance of small-area light sources and displays at 555 nm
Converting radiometric data to photometric luminance for vision research and instrument calibration
Specifying or comparing optical system output such as LEDs and lamps in photometric testing
Designing lighting and signage to ensure appropriate brightness and visibility
Calibrating cameras and photometric instruments using standardized luminance units

Tips & Best Practices

Ensure input values are measured exactly at the 555 nm wavelength for accurate conversion
Verify units carefully to prevent computation errors due to large conversion factors
Apply this conversion only for photopic spectral radiance, not for broad spectrum sources
Use the conversion result to compare brightness in terms familiar to human vision
Consult additional photometric data when working with complex or broadband lighting

Limitations

Applies solely to measurements at 555 nm wavelength corresponding to photopic vision peak
Does not handle spectral radiance values outside of this wavelength or broadband sources
Conversion accuracy depends on assumptions about human spectral sensitivity
Large conversion factor requires careful numerical handling to avoid precision loss

Frequently Asked Questions

Why is the wavelength 555 nm important for this conversion?: Because 555 nm is the photopic peak of human visual sensitivity, this wavelength is used to connect radiometric measurements with perceived brightness in photometric units.
Can this converter be used for broad spectrum light sources?: No, the conversion is designed specifically for spectral radiance at 555 nm and does not apply to broadband or other wavelength measurements.
What is the numeric factor used in this conversion?: The conversion uses a factor of 6,830,000 to translate 1 watt/sq. cm/steradian at 555 nm into lumen/sq. meter/steradian.

Key Terminology

Watt/sq. cm/steradian (at 555 nm): A radiometric spectral radiance unit measuring radiant power per projected area per solid angle at the wavelength 555 nm.
Lumen/sq. meter/steradian: A photometric luminance unit expressing luminous intensity emitted per projected area per solid angle, equivalent to candela per square meter.
Photopic peak: The wavelength around 555 nm where human visual sensitivity is highest under well-lit conditions.

Quick Knowledge Check

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

Luminous intensity per area and solid angle

Radiometric spectral radiance at 555 nm wavelength

Visible brightness in candela per square meter

What is the equivalent unit to lumen/sq. meter/steradian?

Candela per square meter (cd/m²)

Watt per square centimeter per steradian

Lux

Why is a large conversion factor needed between these units?

Because of differences in spectral sensitivity and unit scaling

To account for broadband light sources

To correct measurement errors

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