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How to Convert from Phot [ph] to Watt/sq. cm (at 555 nm)?
Learn how to convert illuminance values from the older unit phot [ph] to radiometric irradiance units in watts per square centimeter at the specific wavelength of 555 nm. This guide explains the conversion process, uses, and limitations.
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Phot [ph] to Watt/sq. cm (at 555 nm) Conversion Table
| Phot [ph] | 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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| Phot [ph] | Watt/sq. cm (at 555 nm) |
|---|
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What Is This Tool?
This converter helps translate illuminance levels expressed in phot, an older non-SI unit, into radiometric irradiance measured in watts per square centimeter at 555 nm wavelength. It is useful for lighting engineering calibration, scientific studies, and photobiological testing involving green light.
How to Use This Tool?
- Enter the illuminance value in phot [ph] unit
- Select phot as the input unit and watt/sq. cm (at 555 nm) as the output unit
- Apply the conversion formula: multiply the phot value by 0.0014641288
- Review the converted radiometric irradiance result in watt per square centimeter at 555 nm
- Use the results for calibration, measurement, or scientific analysis
Key Features
- Converts phot [ph] values to watt/sq. cm at 555 nm using a fixed conversion rate
- Supports translating photometric illuminance to monochromatic radiometric irradiance
- Provides a straightforward tool for calibration and research applications
- Based on the luminous efficiency peak at 555 nm wavelength
- Includes examples for easy understanding of the conversion
Examples
- 5 Phot [ph] converts to 0.007320644 Watt/sq. cm (at 555 nm)
- 10 Phot [ph] converts to 0.014641288 Watt/sq. cm (at 555 nm)
Common Use Cases
- Calibration of light sources and photometers for accurate illuminance measurements
- Converting measured irradiance to illuminance for lighting design and standards
- Quantifying monochromatic light levels in vision science and psychophysics experiments
- Specifying exposure levels and safety limits for green optical devices at 555 nm
- Analyzing historical lighting data using photometric units in modern radiometric terms
Tips & Best Practices
- Ensure input values are expressed in phot [ph] before conversion
- Remember the conversion applies specifically to monochromatic light at 555 nm
- Use this tool to bridge older photometric units with modern radiometric measurements
- Verify calibration settings with known reference standards after conversion
- Consider spectral characteristics when applying results to real-world mixed light sources
Limitations
- Phot is a non-SI and largely deprecated unit not commonly used in recent standards
- Conversion assumes monochromatic radiation at 555 nm, which may not reflect actual light sources
- Real light sources often have complex spectral distributions requiring detailed weighting
- Conversion accuracy depends on the assumption of the luminous efficiency peak at 555 nm
- This tool does not account for spectral variations beyond the 555 nm reference wavelength
Frequently Asked Questions
- What does the unit phot [ph] represent?
- Phot [ph] is an older, non-SI illuminance unit equal to one lumen per square centimeter or 10,000 lux, formerly used to express high illumination levels.
- Why is 555 nm wavelength important for this conversion?
- 555 nm corresponds to the peak of the human eye's photopic luminous-efficiency function, making it a standard reference for converting radiometric irradiance to photometric illuminance.
- Can this conversion be used for all types of light sources?
- No. The conversion is accurate only for monochromatic light at 555 nm; sources with broad spectral distributions require more complex methods.
Key Terminology
- Phot [ph]
- A non-SI unit of illuminance equal to one lumen per square centimeter or 10,000 lux, used historically in photometry.
- Watt/sq. cm (at 555 nm)
- A radiometric unit measuring radiant power per area at 555 nm wavelength, the eye’s peak photopic sensitivity.
- Luminous efficacy
- A factor relating radiant power at 555 nm to photometric illuminance, considered as 683 lumens per watt.