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

It measures radiometric spectral radiance, expressing radiant power per unit projected area and solid angle at a wavelength of 555 nm.

Why is the wavelength 555 nm important in this conversion?

555 nm corresponds to the photopic peak of human visual sensitivity, making this wavelength key for relating radiometric to photometric luminance.

What is a nit and where is it used?

A nit is a unit of luminance equal to one candela per square meter, commonly used to specify brightness in displays and lighting engineering.

Can this tool convert measurements at wavelengths other than 555 nm?

No, this conversion specifically applies at 555 nm and may not be accurate for other wavelengths or broadband sources.

How to Convert from Watt/sq. cm/steradian (at 555 nm) to Nit [nt]

Learn the process and details for converting luminance from watt per square centimeter per steradian at 555 nm wavelength to nits, a photometric unit reflecting human visual brightness perception.

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

Nit [nt]

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

Watt/sq. cm/steradian (at 555 nm)	Nit [nt]

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Start Value

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

Explore More Luminance Units Converter

What Is This Tool?

This converter allows you to change luminance values measured in watts per square centimeter per steradian at 555 nm into nits, a unit that quantifies perceived brightness as seen by the human eye. The tool is useful for interpreting radiometric data in terms of photometric brightness.

How to Use This Tool?

Enter the luminance value in watt/sq. cm/steradian measured at 555 nm
Select this as the from-unit and nit [nt] as the to-unit
Click convert to obtain the equivalent luminance in nits
Use the result to compare or specify brightness in photometric terms

Key Features

Converts radiometric spectral radiance at 555 nm to photometric luminance in nits
Supports applications involving vision research and display calibration
Browser-based and easy to use with straightforward input and output
Relevant for LED, display, and lighting system measurements
Incorporates the wavelength specific luminous efficiency at the photopic peak

Examples

0.5 Watt/sq. cm/steradian (at 555 nm) converts to 3,415,000 Nit [nt]
0.001 Watt/sq. cm/steradian (at 555 nm) converts to 6,830 Nit [nt]

Common Use Cases

Characterizing the spectral radiance of LEDs and displays at the photopic peak
Converting radiometric measurements to photometric units for human vision
Setting and evaluating brightness standards for digital signage and vehicle displays
Calibration of optical instruments for brightness measurements

Tips & Best Practices

Ensure measurements are taken specifically at 555 nm wavelength for accurate conversion
Use the tool to translate physical radiance data into luminance related to visual perception
Apply conversions within the constraints of standard observer conditions
Verify environmental and spectral conditions to reduce conversion inaccuracies

Limitations

Conversion only applies to measurements at 555 nm wavelength
Does not account for broadband or non-photopic light sources
Dependent on the standard luminous efficiency function and observer assumptions
Environmental and spectral factors may impact result accuracy

Frequently Asked Questions

What does watt/sq. cm/steradian (at 555 nm) measure?: It measures radiometric spectral radiance, expressing radiant power per unit projected area and solid angle at a wavelength of 555 nm.
Why is the wavelength 555 nm important in this conversion?: 555 nm corresponds to the photopic peak of human visual sensitivity, making this wavelength key for relating radiometric to photometric luminance.
What is a nit and where is it used?: A nit is a unit of luminance equal to one candela per square meter, commonly used to specify brightness in displays and lighting engineering.
Can this tool convert measurements at wavelengths other than 555 nm?: No, this conversion specifically applies at 555 nm and may not be accurate for other wavelengths or broadband sources.

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.
Nit [nt]: A photometric unit of luminance equal to one candela per square meter, used to describe perceived brightness.
Photopic Peak: The wavelength (555 nm) where the human eye is most sensitive to light under well-lit conditions.

Quick Knowledge Check

What does 1 nit represent in terms of luminance?

One watt per square meter

One candela per square meter

One lumen per steradian

At which wavelength is the conversion from watt/sq. cm/steradian to nit valid?

450 nm

555 nm

700 nm

Why is the 555 nm wavelength used for this conversion?

It is where human eye sensitivity peaks

It is the average visible wavelength

It corresponds to infrared radiation

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