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How to Convert from Centimeter-candle [cm*c] to Phot [ph]
Learn how to convert illumination values from the obsolete unit centimeter-candle (cm*c) to phot (ph), both used historically to measure high levels of illuminance.
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Centimeter-candle [cm*c] to Phot [ph] Conversion Table
| Centimeter-candle [cm*c] | Phot [ph] |
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| Centimeter-candle [cm*c] | Phot [ph] |
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What Is This Tool?
This converter allows you to change illumination measurements from centimeter-candle (cm*c) to phot (ph), two traditional units representing intense lighting levels, useful in analyzing historical photometry and legacy lighting documents.
How to Use This Tool?
- Enter the illumination value in centimeter-candle (cm*c) into the input field.
- Select or confirm the target unit as phot (ph).
- View the converted value immediately, reflecting the one-to-one equivalence.
Key Features
- Converts between two obsolete but historically significant units of illuminance: centimeter-candle and phot.
- Supports precise translation of older lighting and photographic exposure data.
- Browser-based and easy to use with clearly defined conversion equivalence.
Examples
- Convert 5 cm*c to phot results in 5 ph.
- Convert 0.1 cm*c to phot equals 0.1 ph.
Common Use Cases
- Interpreting historical high-intensity illuminance data in photometry and lighting engineering.
- Comparing vintage optical specifications or photographic lighting levels.
- Restoring or analyzing early lighting standards and exposure tables that used candle-based units.
Tips & Best Practices
- Use this converter primarily for historical or legacy data to maintain consistency across old units.
- Verify the original definition of the candle or candela if precision matters in data interpretation.
- Cross-reference with modern lux measurements when possible for current lighting standards.
Limitations
- Both units are obsolete and replaced by the SI unit lux in modern applications.
- Accuracy depends on the original candle or candela definition that might differ historically.
- Practical use is confined to legacy data interpretation and converting older documents.
Frequently Asked Questions
- Why are centimeter-candle and phot considered obsolete units?
- They have been replaced by the SI unit lux, which is the modern standard for measuring illuminance.
- Do 1 centimeter-candle and 1 phot have the same value?
- Yes, 1 centimeter-candle (cm*c) is exactly equal to 1 phot (ph).
- In what fields is this conversion most relevant?
- This conversion is useful in historical photometry, vintage photography, lighting engineering, and analyzing legacy lighting data.
Key Terminology
- Centimeter-candle [cm*c]
- An obsolete illuminance unit representing the illumination one centimetre from a point source of one candle, historically used in photometry.
- Phot [ph]
- A deprecated non-SI unit of illuminance equal to one lumen per square centimetre, traditionally used to express very bright illumination.
- Illuminance
- A measurement of the amount of light incident on a surface, commonly expressed in units like lux, phot, or centimeter-candle.