What Is This Tool?
This online converter tool enables you to convert illuminance values from meter-candle (m*c), an older unit of illuminance, to lumen per square meter (lm/m²), the modern SI standard equivalent to lux. It helps interpret and apply historical lighting data within contemporary lighting design and measurement contexts.
How to Use This Tool?
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Enter the value in meter-candle (m*c) that you want to convert
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Select meter-candle as the input unit and lumen per square meter as the output unit
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Click the convert button to view the equivalent illuminance in lumen/square meter
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Use the result to compare or standardize lighting measurements
Key Features
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Converts meter-candle values directly to lumen/square meter with a one-to-one equivalence
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Browser-based and easy to use for quick illumination unit conversions
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Supports accurate translation of older lighting measurements to modern standards
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Useful for applications in lighting design, photography, and horticulture
Examples
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200 meter-candle equals 200 lumen per square meter
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500 meter-candle corresponds to 500 lumen per square meter
Common Use Cases
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Converting historical photometry data using metre-candle units to contemporary SI units
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Specifying and verifying lighting levels in offices, classrooms, and public spaces
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Calibrating and interpreting illuminance measurements for photography and display testing
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Controlling light intensity on plants in horticultural and greenhouse settings
Tips & Best Practices
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Always verify the unit labels when working with historical data to ensure accurate interpretation
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Use this converter to standardize lighting data before applying it to modern lighting design standards
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Consider calibration differences in measurement devices even if units are equivalent
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Apply the results to support lighting assessments in workspace, photography, and horticultural applications
Limitations
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The converter applies a direct one-to-one conversion since meter-candle and lumen per square meter are equivalent units
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Care is needed when interpreting historical illuminance data to align with modern lighting standards
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Measurement method differences and calibration variations may influence reported illuminance values
Frequently Asked Questions
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What is the meter-candle unit?
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Meter-candle is an older illuminance unit equal to one lumen per square meter, representing the illuminance from a point source of one candela at one meter distance. It is numerically equivalent to the lux.
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Is there any numerical difference when converting meter-candle to lumen per square meter?
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No, converting meter-candle to lumen per square meter does not involve a numerical change because both units are equal in value.
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Why is it important to convert meter-candle to lumen per square meter?
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Conversion helps translate older illuminance measurements into the modern SI standard, ensuring accurate and standardized lighting assessment, design, and calibration of instruments.
Key Terminology
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Meter-candle [m*c]
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An older illuminance unit equal to one lumen per square meter, representing the illuminance from a one candela point source at one meter distance; equivalent to the lux.
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Lumen per square meter [lm/m^2]
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The SI derived unit of illuminance, defined as one lumen of luminous flux incident uniformly on one square meter of surface; equivalent to the lux.
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Illuminance
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The amount of visible light falling on a surface, weighted by the human eye’s photopic response.