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How to Convert from Phot [ph] to Centimeter-candle [cm*c]?
Learn how to convert illumination measurements from phot (ph), an older unit, to centimeter-candle (cm*c), another historical illuminance unit, with clear explanations and examples.
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Phot [ph] to Centimeter-candle [cm*c] Conversion Table
| Phot [ph] | Centimeter-candle [cm*c] |
|---|
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.
| Phot [ph] | Centimeter-candle [cm*c] |
|---|
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What Is This Tool?
This online converter enables you to change illumination values from phot, an older unit representing high illuminance levels, to centimeter-candle, a similarly obsolete unit used in historical photometry and lighting engineering.
How to Use This Tool?
- Enter the illumination value in phot (ph) in the input field
- Select the target unit as centimeter-candle (cm*c)
- Click the convert button to obtain the equivalent value
- Review the result displayed, which is identical due to unit equivalence
- Use the conversion to interpret or compare historical lighting measurements
Key Features
- Convert illumination units between phot and centimeter-candle with ease
- Browser-based tool requiring no installation
- Ideal for translating legacy photometric or lighting data
- Clear examples to demonstrate conversion
- Supports historical and technical lighting analysis
Examples
- 5 ph converts to 5 cm*c
- 0.1 ph converts to 0.1 cm*c
Common Use Cases
- Interpreting bright illumination levels recorded in phot units
- Converting historical lighting and photographic exposure data
- Comparing or specifying intense illuminance close to small light sources in older documents
- Integrating legacy measurements with modern lux-based datasets
- Supporting photometry and lighting engineering analysis in a historical context
Tips & Best Practices
- Remember both phot and centimeter-candle are outdated and replaced by lux for current use
- Use the converter mainly for historical data interpretation and legacy document reference
- Account for potential practical differences in source geometry when applying conversions in real-world situations
- Verify unit definitions align when comparing measurements from different sources
Limitations
- Units phot and centimeter-candle are obsolete and superseded by the SI lux
- Direct equivalence assumes consistent historical definitions that may vary
- Conversion does not consider practical measurement factors such as light source geometry or instrument specifics
- Not suitable for modern lighting engineering requirements
Frequently Asked Questions
- What is the phot unit used for?
- Phot is an older, non-SI unit of illuminance typically used to express very high levels of illumination, such as direct sunlight or studio lighting, historically used in photometry and lighting engineering.
- How does a centimeter-candle relate to modern units?
- The centimeter-candle is an obsolete unit equal to the illuminance from a point source one centimetre away with one candle; it has been replaced by the lux in modern measurements.
- Are phot and centimeter-candle units exactly the same?
- Yes, according to historical definitions, 1 phot equals 1 centimeter-candle, but practical uses may vary due to differences in measurement contexts.
Key Terminology
- Phot [ph]
- A historical illuminance unit equal to one lumen per square centimetre, representing very high light levels.
- Centimeter-candle [cm*c]
- An obsolete illuminance unit based on a point source of one candle located one centimetre away, historically used in photometry.
- Lux
- The modern SI unit of illuminance, measuring luminous flux per square meter.