What Is This Tool?
This unit converter transforms luminance values from foot-lambert (fL) to candela per square foot. Both units measure surface brightness in imperial terms and are commonly used in cinema projection, home-theater calibration, and display technology design.
How to Use This Tool?
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Enter the luminance value in foot-lambert (fL)
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Select the target unit as candela per square foot
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Click convert to obtain the equivalent luminance value
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Use the conversion factor of 1 foot-lambert = 0.3183098862 candela per square foot for manual calculations if needed
Key Features
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Converts luminance measurements between foot-lambert and candela per square foot
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Supports imperial unit conversions relevant to display and projection brightness
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Provides practical examples for quick reference
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Browser-based and easy to use without additional software
Examples
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5 foot-lamberts converts to 1.591549431 candela per square foot
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10 foot-lamberts converts to 3.183098862 candela per square foot
Common Use Cases
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Specifying and measuring projected-screen brightness in cinemas and home theaters
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Designing and testing theater projection systems
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Calibrating display brightness where imperial units are standard
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Lighting design and signage assessments that use square-foot area units
Tips & Best Practices
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Ensure consistent measurement of projected area when using foot-lambert values
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Use precise calculations involving the factor 1/π for accurate conversions
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Confirm instrument calibration to maintain measurement reliability
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Remember that both units are imperial and may require conversion for international standards
Limitations
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Precision is essential due to the 1/π factor in foot-lambert definitions
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Imperial units like these are less common globally, requiring extra conversion steps when working internationally
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Measurement depends on consistent area definitions and instrument calibration
Frequently Asked Questions
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What is the foot-lambert used for?
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Foot-lambert measures luminance, often to specify projected screen brightness in cinemas and home theater calibration.
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How do foot-lambert and candela per square foot relate?
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One foot-lambert equals approximately 0.3183 candela per square foot, both expressing luminous intensity per unit area.
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Why might I convert between these two units?
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Converting helps compare and calibrate luminance values in systems or specifications that use different but related imperial units.
Key Terminology
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Foot-lambert [fL]
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An imperial luminance unit measuring luminous intensity per projected area; one foot-lambert equals 1/π candela per square foot.
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Candela per square foot
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A luminance unit expressing brightness as luminous intensity per square foot; used commonly in imperial measurement contexts.
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Luminance
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The measurement of luminous intensity emitted or reflected from a surface per unit area.