What Is This Tool?
This converter transforms measurements of luminance from millilambert, a traditional unit often used in cinematography and imaging, into lumen per square centimetre per steradian, a modern photometric unit suited for precise brightness measurement on small or bright surfaces.
How to Use This Tool?
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Enter the luminance value in millilambert (mL)
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Select millilambert as the input unit and lumen/sq. cm/steradian as the output unit
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Click the convert button to get the equivalent luminance in lumen per square centimetre per steradian
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Review the result and utilize it for your specific luminance evaluation or calibration needs
Key Features
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Supports conversion between millilambert (mL) and lumen/sq. cm/steradian units
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Facilitates translation of legacy luminance values into specialized photometric units
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Includes clear conversion formula and practical usage examples
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Useful for applications in cinematography, imaging labs, and micro-scale light source measurement
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Browser-based and easy to use with no installation required
Examples
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5 Millilambert [mL] equals approximately 0.0015915495 Lumen/sq. cm/steradian
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10 Millilambert [mL] equals approximately 0.003183099 Lumen/sq. cm/steradian
Common Use Cases
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Specifying display and projector screen luminance in cinematography and broadcast engineering
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Characterizing photographic prints, film, and lightbox luminance in imaging laboratories
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Calibrating and testing luminance meters for small-area or high-intensity samples
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Measuring brightness of micro-LED or OLED pixel emitters in high-precision optical design
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Converting historically used luminance units into modern SI-based values for analysis
Tips & Best Practices
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Verify unit selections before conversion to ensure accuracy
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Use this tool primarily for small-area or high-brightness photometric assessments
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Consider the legacy nature of millilambert when interpreting converted results
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Apply conversions carefully when calibrating sensitive luminance measurement instruments
Limitations
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Millilambert is a non-SI, mostly outdated unit which may cause rounding approximations
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Lumen/sq. cm/steradian is specialized for micro-scale luminance and may not suit larger surfaces
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Interpreting results requires understanding of the units’ appropriate contexts
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Conversion should be used cautiously in generalized luminance assessments beyond high-precision needs
Frequently Asked Questions
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What is a millilambert used for?
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Millilambert is primarily used in cinematography, broadcast engineering, and imaging labs to specify luminance of displays, photographic prints, and films.
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How does lumen/sq. cm/steradian relate to candela per square centimetre?
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Lumen per square centimetre per steradian is equivalent to candela per square centimetre, representing luminous intensity per unit area.
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Can I use this conversion for large surface luminance measurements?
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This conversion is best suited for small or high-brightness areas; for larger surfaces, the units and conversion may not be appropriate.
Key Terminology
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Millilambert (mL)
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A non-SI unit of luminance equal to one-thousandth of a lambert used to quantify luminous intensity per unit area and solid angle.
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Lumen/sq. cm/steradian
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A photometric unit measuring luminous flux per unit area per unit solid angle, equivalent to candela per square centimetre.
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Luminance
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A photometric measure of the luminous intensity per unit area of light travelling in a given direction.