What Is This Tool?
This tool helps convert luminance measurements from candela per square meter, an SI unit used to specify brightness in displays and lighting design, to lumen per square foot per steradian, a customary U.S. unit measuring visible light intensity per area and solid angle.
How to Use This Tool?
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Enter the luminance value measured in candela per square meter.
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Select the input unit as candela/square meter.
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Choose the output unit as lumen/square foot/steradian.
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Click the convert button to see the result in the desired unit.
Key Features
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Quickly converts between candela/square meter and lumen/square foot/steradian units.
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Supports luminance measurements in both SI and customary U.S. units.
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User-friendly interface for accurate luminance conversion.
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Browser-based and accessible without installation.
Examples
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Converting 10 candela/square meter results in 0.9290304 lumen/square foot/steradian.
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Converting 5 candela/square meter results in 0.4645152 lumen/square foot/steradian.
Common Use Cases
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Specifying and measuring display brightness in TVs, monitors, and smartphones.
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Lighting and architectural design to evaluate surface brightness using customary units.
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Testing and calibrating luminance of road signs and safety signage.
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Assessing brightness of outdoor signs and billboards in regions using foot-based units.
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Calibrating photometric instruments that report luminance in non-SI units.
Tips & Best Practices
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Ensure unit selections match measurement standards used in your industry or region.
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Use precise input values for accurate conversion results.
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Be mindful of differences in area units (square meters vs. square feet) when interpreting results.
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Regularly calibrate measurement instruments to maintain reliability.
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Consider viewing geometry and surface orientation in luminance assessments.
Limitations
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Conversion requires careful attention due to different definitions of area units.
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Non-SI units may cause rounding differences and need proper calibration.
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Conversion applies specifically to luminance units and directional properties.
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Perceived luminance can vary with surface orientation and observation angle.
Frequently Asked Questions
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What does candela per square meter measure?
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Candela per square meter is the SI unit of luminance representing the luminous intensity emitted or reflected by a surface per unit area in a specific direction.
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Why convert to lumen per square foot per steradian?
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This conversion helps translate luminance measurements into U.S. customary units for applications like outdoor signage and architectural lighting using foot-based measurements.
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Is this unit converter suitable for all brightness measurements?
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This converter is designed specifically for luminance values in candela/square meter to lumen/square foot/steradian and should be used accordingly, considering orientation and viewing geometry.
Key Terminology
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Candela per square meter (cd/m²)
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The SI unit of luminance describing luminous intensity per unit projected area in a given direction, often called a nit.
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Lumen per square foot per steradian
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A non-SI luminance unit expressing luminous flux per unit area per unit solid angle, equivalent to candelas per square foot.
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Luminance
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The measure of luminous intensity per unit area visible from a particular direction, indicating surface brightness.