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How to Convert from Watt/sq. cm (at 555 nm) to Lumen/square meter [lm/m^2]
Learn how to convert measurements from watt per square centimeter at 555 nm to lumen per square meter for accurate illumination analysis, lighting design, and photometry calibration.
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Watt/sq. cm (at 555 nm) to Lumen/square meter [lm/m^2] Conversion Table
| Watt/sq. cm (at 555 nm) | Lumen/square meter [lm/m^2] |
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Custom Unit Conversion Table Generator – Instant Printable Conversion Tables
Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.
Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.
Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.
| Watt/sq. cm (at 555 nm) | Lumen/square meter [lm/m^2] |
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What Is This Tool?
This converter transforms radiant power measured in watt per square centimeter at the specific wavelength of 555 nm into lumen per square meter, a photometric unit that represents visible light intensity perceived by the human eye.
How to Use This Tool?
- Enter the irradiance value in watt/sq. cm at 555 nm.
- Select the conversion to lumen/square meter [lm/m^2].
- Review the converted value reflecting illuminance weighted by the human eye’s sensitivity.
- Use the result for your lighting design, calibration, or research needs.
Key Features
- Converts monochromatic irradiance at 555 nm to photometric illuminance in lumen per square meter.
- Utilizes the luminous efficacy of 683 lm/W for precise conversion.
- Ideal for applications in lighting design, vision science, and photobiological testing.
- Provides clear examples for practical understanding of unit conversion.
- Browser-based and easy to use for quick calculations.
Examples
- 0.5 watt/sq. cm (at 555 nm) converts to 3,415,000 lumen/square meter [lm/m^2].
- 0.1 watt/sq. cm (at 555 nm) converts to 683,000 lumen/square meter [lm/m^2].
Common Use Cases
- Converting measured irradiance to illuminance for lighting design and standards compliance.
- Calibrating light sources and photometers to match human photopic sensitivity.
- Assessing exposure levels in vision science and photobiological safety testing.
- Setting and verifying lighting conditions in photography and cinematography.
- Controlling light intensity for plant growth in horticulture and greenhouses.
Tips & Best Practices
- Ensure that your irradiance measurement is specifically at 555 nm for accurate conversion.
- Use the tool for monochromatic light rather than broadband sources due to spectral weighting limitations.
- Apply results primarily for photopic vision-related assessments and lighting designs.
- Double-check units entered to maintain conversion accuracy.
- Leverage examples to validate your inputs and understand output measurements.
Limitations
- Conversion applies only to monochromatic irradiance at 555 nm using the photopic luminous-efficiency function.
- It does not accommodate spectral distributions beyond 555 nm, limiting use with broadband light sources.
- More complex spectral weighting is required to convert broadband irradiance accurately.
Frequently Asked Questions
- Why is 555 nm used as the reference wavelength in this conversion?
- 555 nm corresponds to the peak of the human eye’s photopic luminous-efficiency function, making it the standard wavelength for photometric conversions related to visible light sensitivity.
- Can this conversion be used for light sources with multiple wavelengths?
- No, this specific converter works only for monochromatic irradiance at 555 nm and does not handle spectral distributions from broadband sources.
- What is the relationship between lumen/square meter and lux?
- Lumen per square meter is equivalent to lux; both quantify illuminance as the visible light incident on a surface.
Key Terminology
- Watt/sq. cm (at 555 nm)
- A radiometric measure of radiant power per unit area at the peak wavelength 555 nm, used to quantify monochromatic irradiance.
- Lumen/square meter [lm/m^2]
- An SI derived unit of illuminance representing visible light flux incident uniformly on one square meter, equivalent to lux.
- Photopic luminous-efficiency function
- The spectral sensitivity curve of the human eye under well-lit conditions, peaking at 555 nm, used to weight visible light measurements.