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How to Convert from Lumen/square foot [lm/ft^2] to Watt/sq. cm (at 555 nm)?
Learn how to convert illuminance measurements from lumen per square foot to radiometric irradiance in watts per square centimeter at 555 nm with this practical unit conversion guide.
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Lumen/square foot [lm/ft^2] to Watt/sq. cm (at 555 nm) Conversion Table
| Lumen/square foot [lm/ft^2] | Watt/sq. cm (at 555 nm) |
|---|
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.
| Lumen/square foot [lm/ft^2] | Watt/sq. cm (at 555 nm) |
|---|
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- How to convert from lumen/square foot [lm/ft^2] to watt/sq. cm (at 555 nm)?
What Is This Tool?
This converter transforms illumination values from lumen per square foot, a common photometric unit, into watt per square centimeter at the wavelength 555 nm, enabling precise radiometric and photometric analysis in various scientific and practical contexts.
How to Use This Tool?
- Enter the value in lumen per square foot (lm/ft²) that you want to convert.
- Select the conversion to watt per square centimeter at 555 nm.
- Execute the conversion to obtain the corresponding radiometric irradiance value.
- Review example results to confirm correct use.
Key Features
- Converts lumen/square foot (lm/ft²) to watt/sq. cm at 555 nm accurately following the defined formula.
- Supports lighting professionals by facilitating unit changes between illuminance and irradiance.
- Designed for use in lighting design, vision research, and photobiological safety evaluation.
- Includes example conversions for easy understanding.
- Browser-based and straightforward tool for quick calculations.
Examples
- 100 lm/ft² converts to approximately 0.0001576 W/sq. cm (at 555 nm).
- 500 lm/ft² converts to approximately 0.0007880 W/sq. cm (at 555 nm).
Common Use Cases
- Specifying and verifying indoor lighting levels in offices, classrooms, and retail environments.
- Calibrating light sources and photometers based on radiant power at the photopic peak.
- Measuring illumination for photography, stage lighting, and display setups.
- Quantifying light exposure in vision science and psychophysics at 555 nm sensitivity.
- Determining safety limits for green optical sources in photobiological testing.
- Controlling horticultural lighting and monitoring museum or gallery illumination.
Tips & Best Practices
- Ensure illumination measurements are monochromatic at 555 nm to apply this conversion accurately.
- Use this tool when translating photometric units into radiometric equivalents focused on peak photopic sensitivity.
- Cross-check results as radiometric and photometric units quantify different physical phenomena.
- Leverage example values for validating typical conversion scenarios.
- Consider the application context such as safety testing or calibration for best outcomes.
Limitations
- Conversion is specific to monochromatic light at 555 nm and may not suit broadband or other wavelengths.
- Photometric and radiometric units measure fundamentally different properties, so interpretations require caution.
- Results may not reflect accurate irradiance for mixed or spectral light sources.
Frequently Asked Questions
- Why is the wavelength 555 nm important in this conversion?
- 555 nm corresponds to the peak of the photopic luminous-efficiency function, making it the standard wavelength for relating radiometric power to photometric illuminance.
- Can this conversion be used for light sources with multiple wavelengths?
- No, the conversion is designed for monochromatic light at 555 nm and may not apply accurately to broadband or mixed wavelength sources.
- What practical areas benefit from converting lumen/square foot to watt/sq. cm at 555 nm?
- Lighting design, photometric calibration, vision science, photobiological safety testing, and device characterization involving green light exposure are common fields that use this conversion.
Key Terminology
- Lumen/square foot (lm/ft²)
- A photometric unit that quantifies luminous flux incident on one square foot of surface area, equivalent to a foot-candle.
- Watt/sq. cm (at 555 nm)
- A radiometric unit measuring radiant power per square centimeter at the specific wavelength of 555 nanometers, representative of peak photopic sensitivity.
- Photopic luminous-efficiency function
- A standard curve describing human eye sensitivity to different wavelengths under well-lit conditions, peaking at 555 nm.