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How to Convert from Watt/sq. cm (at 555 nm) to Lumen/square foot [lm/ft^2]
Convert illumination units from watt per square centimeter at 555 nm wavelength to lumen per square foot with this easy-to-use online tool designed for lighting professionals and researchers.
Please check your input. It must be a valid numeric value.
Watt/sq. cm (at 555 nm) to Lumen/square foot [lm/ft^2] Conversion Table
| Watt/sq. cm (at 555 nm) | Lumen/square foot [lm/ft^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 foot [lm/ft^2] |
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What Is This Tool?
This converter transforms radiometric irradiance at the 555 nm wavelength, measured in watt/sq. cm, into photometric illuminance expressed in lumen per square foot. It is useful for correlating precise monochromatic light measurements to practical lighting units.
How to Use This Tool?
- Enter the value in watt/sq. cm (at 555 nm) you wish to convert
- Select the output unit as lumen per square foot [lm/ft²]
- Click the convert button to get the result displayed instantly
- Use the results to interpret lighting levels in practical or research contexts
Key Features
- Converts watt/sq. cm (at 555 nm) to lumen/square foot (lm/ft²)
- Uses luminous efficacy of 683 lm/W at 555 nm to relate radiometric and photometric units
- Supports applications in lighting design, vision science, and photobiological safety
- Provides example conversions for quick reference
Examples
- 0.000001 watt/sq. cm (at 555 nm) equals approximately 0.6345278 lumen/square foot
- 0.0001 watt/sq. cm (at 555 nm) equals approximately 63.4527763 lumen/square foot
Common Use Cases
- Calibrating light sources and photometers by converting monochromatic irradiance to illuminance
- Quantifying stimulus levels at the photopic sensitivity peak in vision research
- Setting exposure limits for green optical sources in photobiological testing
- Specifying indoor lighting levels for commercial and educational environments
- Determining lighting conditions for photography, stage lighting, and horticulture
Tips & Best Practices
- Ensure instruments measuring irradiance are calibrated specifically for 555 nm wavelength
- Use the conversion only for monochromatic light sources at 555 nm for accurate results
- Handle large numerical values carefully to maintain precision in calculations
- Apply the conversion output to practical lighting design and safety standards appropriately
Limitations
- Only applies to monochromatic light at 555 nm and cannot be used for broadband or polychromatic sources
- Conversion relies on luminous efficacy specific to the 555 nm wavelength
- Accuracy depends on the calibration of instruments specialized for this wavelength
- Large conversion factor requires careful numerical precision when performing calculations
Frequently Asked Questions
- Why is the 555 nm wavelength used for this conversion?
- Because 555 nm corresponds to the peak of the photopic luminous-efficiency function, making it the standard reference for converting monochromatic irradiance to illuminance.
- Can this converter be used for all types of light sources?
- No, it is only applicable to monochromatic light at 555 nm. It is not suited for broadband or mixed-wavelength lighting.
- What industries benefit most from this conversion tool?
- Lighting design and manufacturing, vision science research, photobiological safety testing, photography, horticulture, and interior architectural lighting.
Key Terminology
- Watt/sq. cm (at 555 nm)
- A radiometric unit measuring radiant power per unit area at the specific wavelength of 555 nm.
- Lumen/square foot [lm/ft²]
- A photometric unit indicating luminous flux incident on one square foot of surface, also known as foot-candle.
- Luminous efficacy
- The ratio of luminous flux to radiant power; at 555 nm, it is standardized as 683 lumens per watt.