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How to Convert from Lumen/square meter [lm/m^2] to Phot [ph]?
Convert illumination values from lumen per square meter (lux) to phot, an older unit used for expressing high levels of illuminance in photometry and lighting engineering.
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Lumen/square meter [lm/m^2] to Phot [ph] Conversion Table
| Lumen/square meter [lm/m^2] | 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.
| Lumen/square meter [lm/m^2] | Phot [ph] |
|---|
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What Is This Tool?
This tool converts values between lumen per square meter (lm/m²), the SI unit for illuminance, and phot (ph), a non-SI unit formerly used to indicate very bright lighting conditions.
How to Use This Tool?
- Enter the illuminance value in lumen per square meter (lm/m²)
- Select lumen/square meter as the source unit
- Select phot as the target unit
- Click convert to get the equivalent illuminance in phot
Key Features
- Convert illumination units from lumen per square meter to phot instantly
- Supports understanding of historical lighting units and standards
- Browser-based and simple interface for quick conversions
Examples
- 500 lumen/square meter equals 0.05 phot
- 10,000 lumen/square meter equals 1 phot
Common Use Cases
- Specifying and checking lighting levels for workspaces and classrooms
- Setting lighting and camera parameters in photography and cinematography
- Expressing high illumination in horticulture and greenhouse lighting
- Interpreting and converting historical lighting and exposure data involving phot
Tips & Best Practices
- Use lumen per square meter (lux) for most modern lighting measurements
- Reserve phot units for very bright lighting or legacy data interpretation
- Verify units carefully when working with historical photometric documents
- Be aware of the phot’s limitations in representing low-light levels
Limitations
- Phot is a largely obsolete, non-SI unit and rarely used in modern contexts
- The unit is practical only for very high illuminance values (10,000 lux and above)
- Not suitable for precise conversion in low-light situations
- Differences in historical usage may cause discrepancies with current standards
Frequently Asked Questions
- What does 1 lumen per square meter represent?
- It represents the illuminance on a surface receiving one lumen of luminous flux uniformly over one square meter, equivalent to 1 lux.
- Why convert lumen/square meter to phot?
- To express very bright illumination levels in terms used historically in photometry and lighting engineering, especially for interpreting older standards.
- Is phot still commonly used today?
- No, phot is an obsolete, non-SI unit replaced by lux in most modern applications, but remains useful for historical data and very high illuminance values.
Key Terminology
- Lumen per square meter [lm/m^2]
- SI derived unit of illuminance equal to one lumen uniformly incident on one square meter, also known as lux.
- Phot [ph]
- A non-SI unit of illuminance equal to one lumen per square centimeter, equivalent to 10,000 lux, used historically for high levels of illumination.