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How to Convert Candela steradian/sq. meter to Phot [ph]
Convert units of illuminance from candela steradian per square meter to the phot unit with easy-to-follow steps and understand their applications in lighting and photometry.
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Candela steradian/sq. meter to Phot [ph] Conversion Table
| Candela steradian/sq. meter | Phot [ph] |
|---|
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.
| Candela steradian/sq. meter | Phot [ph] |
|---|
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What Is This Tool?
This converter helps transform values of illuminance measured in candela steradian per square meter into phot units. It is useful for translating modern SI-based lighting levels into an older illuminance unit used historically in photometry and lighting engineering.
How to Use This Tool?
- Enter the illuminance value in candela steradian per square meter you want to convert.
- Select the target unit as phot [ph] for the conversion.
- View the converted illuminance result in phot units instantly.
Key Features
- Converts candela steradian per square meter to phot units accurately.
- Supports illumination measurements used in photography, lighting design, and calibration.
- Browser-based and straightforward to use with clear input and output fields.
- Provides historical context for understanding the phot unit's application.
Examples
- 500 cd·sr·m⁻² converts to 0.05 ph.
- 20 cd·sr·m⁻² converts to 0.002 ph.
Common Use Cases
- Specifying indoor lighting levels for workplaces and classrooms according to traditional standards.
- Describing very bright illumination such as direct sunlight in older units.
- Analyzing historical lighting and photographic exposure data.
- Calibrating light meters and measuring light exposure in photography.
Tips & Best Practices
- Ensure you understand the scale difference since 1 phot equals 10,000 lux, which affects result interpretation.
- Use the converter mainly for historical or legacy documentation that uses phot units.
- Double-check conversions when comparing with modern illumination standards given the different unit systems.
Limitations
- The phot unit is a non-SI measurement and is rarely used in current standards.
- Large scale differences require careful attention to avoid confusion in practical applications.
Frequently Asked Questions
- What does candela steradian per square meter measure?
- It measures illuminance, which is the luminous flux incident on a surface per unit area and is numerically equivalent to the lux.
- Why convert to phot units?
- Phot units are useful for expressing very bright illumination levels and understanding historical and photographic lighting data where phot was commonly used.
- Is the phot unit commonly used today?
- No, phot is a non-SI unit and has mostly been replaced by lux in modern lighting standards.
Key Terminology
- Candela steradian per square meter
- Unit measuring illuminance, equal to one lumen per square meter, numerically equivalent to lux.
- Phot [ph]
- A non-SI unit of illuminance equal to one lumen per square centimetre, or 10,000 lux, historically used to express high illumination levels.
- Illuminance
- The luminous flux incident on a surface per unit area, a key concept in photometry and lighting engineering.