What does candela per square foot measure?

Candela per square foot measures luminance as the luminous intensity emitted or reflected by a surface per square foot area, indicating apparent brightness.

Why is the wavelength 555 nm important in this conversion?

The 555 nm wavelength corresponds to the photopic peak sensitivity of human vision, making it essential for relating photometric and radiometric quantities accurately.

Can I use this conversion for non-visual wavelengths?

No, this conversion is specific to 555 nm and may not apply correctly to other wavelengths or broadband lighting conditions.

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

Learn how to convert luminance values from candela per square foot to watt per square centimeter per steradian at 555 nm with clear examples and practical use cases.

Candela/square foot

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

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

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

Candela/square foot	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.

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

Explore More Luminance Units Converter

What Is This Tool?

This converter transforms luminance measurements from the unit candela per square foot, an imperial photometric unit, to watt per square centimeter per steradian at 555 nm, a radiometric spectral radiance unit. It aids in relating brightness perception to radiometric values at the peak of human visual sensitivity.

How to Use This Tool?

Enter the luminance value in candela per square foot
Select candela/square foot as the input unit
Choose watt per square centimeter per steradian at 555 nm as the output unit
Click convert to obtain the equivalent spectral radiance measurement
Review the result based on the provided formula and conversion factor

Key Features

Converts luminance from candela/square foot to watt/sq. cm/steradian at 555 nm
Aligns photometric and radiometric units using the wavelength 555 nm for peak human vision
Provides straightforward formula and conversion rate
Includes practical examples for quick reference
Supports use in vision research, optical calibration, and display testing

Examples

5 candela/square foot converts to 0.0000078798758540995 watt/sq. cm/steradian (at 555 nm)
10 candela/square foot converts to 0.000015759751708199 watt/sq. cm/steradian (at 555 nm)

Common Use Cases

Specifying or measuring display and monitor brightness in imperial units
Characterizing spectral radiance for vision research and instrument calibration
Setting and verifying projection screen luminance in cinema and theater lighting
Converting photometric luminance to radiometric spectral radiance at 555 nm
Comparing LED or lamp output in optical metrology and photometric testing

Tips & Best Practices

Ensure the conversion is applied at wavelength 555 nm to align with photopic vision peak
Use calibration data when converting between photometric and radiometric quantities
Verify units carefully to avoid confusion between photometric and radiometric measurements
Apply this conversion tool in standardized lighting and display settings for accuracy
Consult domain-specific standards when using these conversions in professional contexts

Limitations

Conversion is specific to the wavelength 555 nm and not valid for broadband spectra
Photometric and radiometric units represent different physical quantities requiring context for use
Calibration and wavelength-specific constants are necessary for precise conversions
This tool does not account for variations outside of standardized measurement conditions

Frequently Asked Questions

What does candela per square foot measure?: Candela per square foot measures luminance as the luminous intensity emitted or reflected by a surface per square foot area, indicating apparent brightness.
Why is the wavelength 555 nm important in this conversion?: The 555 nm wavelength corresponds to the photopic peak sensitivity of human vision, making it essential for relating photometric and radiometric quantities accurately.
Can I use this conversion for non-visual wavelengths?: No, this conversion is specific to 555 nm and may not apply correctly to other wavelengths or broadband lighting conditions.

Key Terminology

Candela per square foot: A non‑SI luminance unit representing luminous intensity per unit area of one square foot, indicating surface brightness.
Watt per square centimeter per steradian (at 555 nm): A radiometric spectral radiance unit measuring radiant power per unit projected area per unit solid angle at the wavelength 555 nm.
Photopic peak: The wavelength around 555 nm where human visual sensitivity to light is at its maximum under well-lit conditions.

Quick Knowledge Check

What unit does candela per square foot measure?

Radiometric spectral radiance

Photometric luminance

Electrical power output

At which wavelength is the conversion to watt/sq. cm/steradian applicable?

450 nm

555 nm

700 nm

What is the main application of converting candela/square foot to watt/sq. cm/steradian at 555 nm?

Measuring electrical consumption

Relating brightness perception to radiometric measurements

Calculating area in square feet

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