Why is the conversion specific to 555 nm wavelength?

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

Can I use this conversion for other wavelengths?

No, applying this conversion to wavelengths other than 555 nm may produce inaccurate results as it is tailored to the photopic peak.

What does lumen/sq. meter/steradian measure?

It measures luminance, which quantifies how bright a surface appears in a given direction based on luminous intensity per unit area per unit solid angle.

How does watt/sq. cm/steradian differ from lumen/sq. meter/steradian?

Watt/sq. cm/steradian is a radiometric measure of spectral radiance at 555 nm, indicating radiant power per area per angle, while lumen/sq. meter/steradian measures perceived brightness.

What industries commonly use this conversion?

Display manufacturing, optical metrology, vision research, lighting design, and photometric calibration frequently rely on this conversion.

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

Easily convert luminance measurements from lumen per square meter per steradian to watt per square centimeter per steradian at 555 nm. Understand the relationship between photometric and radiometric units for display, lighting, and optical applications.

Lumen/sq. meter/steradian

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

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

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

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

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

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

Explore More Luminance Units Converter

What Is This Tool?

This converter transforms luminance values measured in lumen per square meter per steradian into radiometric spectral radiance expressed as watts per square centimeter per steradian at 555 nm wavelength. It bridges brightness perception units with physical radiant power measurements.

How to Use This Tool?

Enter the luminance value in lumen per square meter per steradian
Select the input unit: lumen/sq. meter/steradian
Choose the output unit: watt/sq. cm/steradian at 555 nm
Click convert to obtain the corresponding radiometric spectral radiance
Use the result to relate luminous brightness to radiant power at 555 nm

Key Features

Converts between photometric luminance and radiometric spectral radiance units
Focuses on wavelength 555 nm aligning with peak human visual sensitivity
Supports applications in display manufacturing, vision research, and optical metrology
Includes accurate unit definitions and a precise conversion factor
Browser-based and user-friendly interface

Examples

Convert 100 lumen/sq. meter/steradian to watt/sq. cm/steradian at 555 nm resulting in 1.4641288433382e-5 watt/sq. cm/steradian
Convert 500 lumen/sq. meter/steradian to watt/sq. cm/steradian at 555 nm resulting in 7.320644216691e-5 watt/sq. cm/steradian

Common Use Cases

Specifying display brightness for devices like monitors and smartphones
Calibrating photometric instruments and optical systems
Measuring LED or lamp output at the photopic sensitivity peak
Conducting vision research involving spectral radiance at 555 nm
Designing lighting and signage to ensure visibility and reduce glare

Tips & Best Practices

Ensure the luminance input is accurately measured in lumen/sq. meter/steradian
Use this conversion only for measurements at or near 555 nm wavelength
Understand that radiometric units reflect physical power, not solely perceived brightness
Verify instrument calibration when performing optical measurements
Apply this conversion cautiously if spectral conditions differ from the photopic peak

Limitations

Conversion applies specifically to 555 nm wavelength and may be invalid for other wavelengths
Radiometric values do not fully consider human eye sensitivity outside the selected wavelength
Standard luminous efficiency assumptions may not hold for all observer or lighting conditions
The tool does not account for spectral variations or complex lighting environments

Frequently Asked Questions

Why is the conversion specific to 555 nm wavelength?: Because 555 nm corresponds to the peak sensitivity of human photopic vision, making it a standard reference for relating photometric units to radiometric measurements.
Can I use this conversion for other wavelengths?: No, applying this conversion to wavelengths other than 555 nm may produce inaccurate results as it is tailored to the photopic peak.
What does lumen/sq. meter/steradian measure?: It measures luminance, which quantifies how bright a surface appears in a given direction based on luminous intensity per unit area per unit solid angle.
How does watt/sq. cm/steradian differ from lumen/sq. meter/steradian?: Watt/sq. cm/steradian is a radiometric measure of spectral radiance at 555 nm, indicating radiant power per area per angle, while lumen/sq. meter/steradian measures perceived brightness.
What industries commonly use this conversion?: Display manufacturing, optical metrology, vision research, lighting design, and photometric calibration frequently rely on this conversion.

Key Terminology

Luminance: The luminous intensity emitted or reflected from a surface per unit area per unit solid angle, measured in lm·m⁻²·sr⁻¹ or cd/m².
Radiometric Spectral Radiance: Radiant power emitted per unit projected area per unit solid angle at a specific wavelength, expressed in watts per square centimeter per steradian.
Steradian: A unit of measure for the solid angle subtended at a point by an area on the surface of a sphere.
Photopic Peak: The wavelength, approximately 555 nm, where the human eye has maximum sensitivity under well-lit conditions.
Conversion Factor: The numeric value used to translate units from lumen/sq. meter/steradian to watt/sq. cm/steradian at 555 nm: 1.4641288433382e-7.

Quick Knowledge Check

What does the unit lumen/sq. meter/steradian represent?

Radiant power per unit area and angle

Luminous intensity per projected area per solid angle

Spectral radiance at 555 nm

Why is the conversion factor wavelength-specific to 555 nm?

Because it is the infrared peak sensitivity

Because it matches the peak photopic human eye sensitivity

Because it measures ultraviolet light output

Which field benefits from converting lumen/sq. meter/steradian to watt/sq. cm/steradian at 555 nm?

Vision research and instrument calibration

Mechanical engineering analysis

Chemical compound measurement

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