What Is This Tool?
This converter transforms illumination measurements from candela steradian per square meter, a photometric unit equivalent to lux, into watt per square centimeter at the 555 nm wavelength. It bridges photometric illuminance and radiometric irradiance, aiding in accurate lighting calibration and scientific research.
How to Use This Tool?
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Enter the value in candela steradian per square meter
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Select the target unit watt per square centimeter at 555 nm
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Execute the conversion to obtain the equivalent radiometric measurement
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Apply the result for lighting calibration, photometry, or vision science analysis
Key Features
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Converts candela steradian/sq. meter (cd·sr·m⁻²) to watt/sq. cm at 555 nm
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Tailored for illuminance and irradiance conversions in lighting and vision science
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Supports applications requiring monochromatic light calibration at the 555 nm peak
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Browser-based and easy to operate for quick unit translation
Examples
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10 candela steradian/sq. meter equals 1.4641288433382e-6 watt/sq. cm (at 555 nm)
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1000 candela steradian/sq. meter converts to 1.4641288433382e-4 watt/sq. cm (at 555 nm)
Common Use Cases
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Evaluating and standardizing indoor lighting levels in offices and classrooms
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Designing and analyzing street and outdoor lighting conditions
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Calibrating photometers and light sources for precise measurements
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Conducting vision science and psychophysics experiments focusing on the 555 nm peak
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Establishing exposure limits and safety standards for 555 nm green optical sources
Tips & Best Practices
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Ensure measurements relate specifically to monochromatic 555 nm light for accurate conversion
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Use the tool for converting photometric data tied to the peak luminous efficiency
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Apply conversions to support lighting design standards and photobiological testing
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Cross-verify results when dealing with non-monochromatic or broadband light sources
Limitations
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Conversion is valid only at the 555 nm wavelength corresponding to peak photopic sensitivity
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Not suitable for wavelengths other than 555 nm or for broad-spectrum illumination
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Assumes monochromatic light; spectral distribution outside 555 nm is not considered
Frequently Asked Questions
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What does candela steradian per square meter measure?
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It measures illuminance and is numerically equal to lux, representing luminous flux per unit area.
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Why is the wavelength 555 nm important for this conversion?
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Because 555 nm is the peak of the photopic luminous-efficiency function, making it the standard reference for visible light measurements.
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Can this converter be used for light sources with mixed wavelengths?
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No, it is designed for monochromatic light at 555 nm and may not provide accurate results for other wavelengths or broad spectra.
Key Terminology
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Candela steradian per square meter (cd·sr·m⁻²)
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A photometric unit measuring illuminance equal to one lumen per square meter, also known as lux.
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Watt per square centimeter at 555 nm
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A radiometric unit quantifying radiant power incident per unit area specifically at the 555 nm wavelength.
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Photopic luminous-efficiency function
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A function describing the average spectral sensitivity of human visual perception under well-lit conditions, peaking at 555 nm.