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How to Convert Foot-candle [ft*c, fc] to Watt/sq. cm (at 555 nm)
Learn how to convert illumination units from foot-candle to watt per square centimeter at 555 nm using our precise online converter tailored for lighting design, photometry, and vision science.
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Foot-candle [ft*c, fc] to Watt/sq. cm (at 555 nm) Conversion Table
| Foot-candle [ft*c, fc] | 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.
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Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.
| Foot-candle [ft*c, fc] | Watt/sq. cm (at 555 nm) |
|---|
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What Is This Tool?
This unit converter facilitates the transformation of illuminance measurements from foot-candles, a common North American unit, to monochromatic irradiance units expressed in watts per square centimeter at 555 nm. It serves professionals requiring exact conversion for lighting calibration and scientific research related to human visual sensitivity.
How to Use This Tool?
- Enter the value you want to convert in foot-candles.
- Select the target unit as watt/sq. cm at the wavelength 555 nm.
- Use the displayed conversion formula and result for your application.
Key Features
- Converts foot-candle (luminous flux per square foot) to watt/sq. cm at 555 nm (radiometric irradiance).
- Supports precise calibration for lighting design and photometry standards.
- Useful for vision science and photobiological safety exposure assessments.
- Provides clear formulas and example conversions for ease of use.
- Browser-based and easy to access without installation.
Examples
- 10 foot-candles converts to 0.000015759751708199 watt/sq. cm at 555 nm.
- 100 foot-candles converts to 0.00015759751708199 watt/sq. cm at 555 nm.
Common Use Cases
- Specifying lighting levels in offices, retail, and building-code compliance.
- Calibrating light sources and photometers for lighting design.
- Conducting vision science and psychophysics experiments focused on peak photopic sensitivity.
- Setting exposure limits in photobiological testing for green optical sources.
- Controlling light levels in museums, galleries, and greenhouses.
Tips & Best Practices
- Ensure the light source is near monochromatic at 555 nm for accurate conversion.
- Use this converter when translating photometric illuminance to radiometric irradiance for precise scientific work.
- Prefer lux measurements for applications requiring strict SI unit compliance.
- Cross-check conversion formulas when using for instrument calibration.
Limitations
- Conversion assumes monochromatic light exactly at 555 nm and is not accurate for broad-spectrum light.
- Foot-candle is a non-SI unit mainly used in North America, limiting applicability in areas requiring SI units.
- Results should not be applied to light sources with varying wavelengths or spectral distributions.
Frequently Asked Questions
- What is a foot-candle and where is it commonly used?
- A foot-candle is a non-SI unit of illuminance equal to one lumen per square foot, widely used in North American lighting for specifying task and ambient light levels.
- Why convert foot-candle to watt/sq. cm at 555 nm?
- This conversion translates photometric illuminance to a radiometric measure at the peak photopic wavelength, important for precise calibration and vision science research.
- Can this conversion be applied to any type of light source?
- No, it assumes monochromatic light at exactly 555 nm, so it is not accurate for broad-spectrum or other wavelengths.
Key Terminology
- Foot-candle
- A unit of illuminance measuring luminous flux per square foot, commonly used in North America.
- Watt/sq. cm at 555 nm
- A radiometric measure of radiant power per unit area at the wavelength of 555 nm, relating to photopic visual sensitivity.
- Photopic luminous-efficiency function
- A function representing the sensitivity of the human eye to different wavelengths under well-lit conditions, peaking at 555 nm.