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How to Convert from Phot [ph] to Candela steradian/sq. meter?
Learn how to convert illuminance values from the older phot (ph) unit to the modern candela steradian per square meter unit, equivalent to lux. Understand key features, usage, examples, and limitations of this unit conversion.
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Phot [ph] to Candela steradian/sq. meter Conversion Table
| Phot [ph] | Candela steradian/sq. meter |
|---|
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] | Candela steradian/sq. meter |
|---|
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What Is This Tool?
This converter allows users to convert illuminance measurements from phot (ph), an older unit, to candela steradian per square meter (cd·sr·m⁻²), a unit equivalent to lux commonly used in photometry and lighting design.
How to Use This Tool?
- Enter the illuminance value in phot (ph) units
- Select phot as the input unit and candela steradian per square meter as the output unit
- Click convert to obtain the equivalent value in candela steradian per square meter
- Review the converted result for use in lighting design or analysis
- Refer to provided examples for practical understanding
Key Features
- Converts illuminance values from phot to candela steradian per square meter
- Supports reinterpretation of historical and high-level illumination data
- Expresses values compatible with current photometric and lighting engineering standards
- Browser-based and easy to use for quick conversions
- Provides clear examples demonstrating conversion calculations
Examples
- 2 ph converts to 20,000 cd·sr·m⁻² by multiplying 2 × 10,000
- 0.5 ph converts to 5,000 cd·sr·m⁻² by multiplying 0.5 × 10,000
Common Use Cases
- Reinterpreting very bright illumination levels such as direct sunlight in modern units
- Updating older lighting and photographic exposure data from ph to lux-equivalent measures
- Specifying and verifying indoor lighting intensity in offices and studios
- Designing and evaluating outdoor and street lighting levels
- Calibrating and measuring light with photometric instruments using standard units
Tips & Best Practices
- Ensure correct unit selection matching the input and output for precise conversion
- Use this tool primarily for legacy data and very high illuminance values
- Cross-check converted values against relevant lighting standards and measurement tools
- Clarify the unit notation used to avoid confusion, especially in technical reports
- Apply conversion results to improve compatibility with modern lighting design
Limitations
- Phot is a non-SI and mostly obsolete unit, so conversions address older data only
- Candela steradian/sq. meter, while numerically equal to lux, differs in notation and usage context
- Accuracy is dependent on the original measurements and consistent lighting conditions
Frequently Asked Questions
- What is a phot (ph) unit used for?
- Phot is an older unit of illuminance used to describe very bright lighting levels, such as direct sunlight, and was common in historical lighting and photographic exposure tables.
- How does candela steradian per square meter relate to lux?
- Candela steradian per square meter is numerically equivalent to lux and measures illuminance, with both units representing luminous flux per unit area.
- Why convert phot to candela steradian per square meter?
- Converting phot to candela steradian per square meter allows reinterpretation of legacy illuminance data into modern, standard units used in lighting design and photometry.
Key Terminology
- Phot (ph)
- An older non-SI unit of illuminance equal to 10,000 lux, used historically to express high-level brightness.
- Candela steradian per square meter (cd·sr·m⁻²)
- A unit measuring illuminance equal in value to lux, expressing luminous flux per unit area.
- Illuminance
- The measure of luminous flux incident on a surface per unit area, indicating brightness.