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How to Convert from Lumen/square foot [lm/ft^2] to Phot [ph]
Learn how to convert illumination measurements from lumen per square foot to phot units with this easy-to-use converter. Understand use cases and examples for high-level lighting applications.
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Lumen/square foot [lm/ft^2] to Phot [ph] Conversion Table
| Lumen/square foot [lm/ft^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 foot [lm/ft^2] | Phot [ph] |
|---|
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What Is This Tool?
This tool converts illumination values from lumen per square foot (lm/ft^2) to phot (ph), helping you express lighting levels suited for very bright conditions or interpret historical lighting standards.
How to Use This Tool?
- Enter the illumination value in lumen per square foot (lm/ft^2)
- Select the target unit as phot (ph)
- The tool applies the conversion rate to provide the equivalent value in ph
- Use the converted value for lighting analysis, historical data interpretation, or technical documentation
Key Features
- Converts lumen/square foot to phot with a precise conversion rate
- Supports illumination units used in lighting engineering and photometry
- Ideal for converting modern measurements to legacy or specialized units
- Applicable for lighting design, photographic, and stage lighting contexts
- Browser-based and user-friendly conversion process
Examples
- Converting 50 lm/ft^2 results in 0.05382 ph
- Converting 200 lm/ft^2 results in 0.21528 ph
Common Use Cases
- Specifying and verifying lighting levels for offices, classrooms, and retail environments
- Measuring and setting illumination in photography, stage, and film lighting
- Positioning grow-lights and controlling light for horticulture or museum displays
- Interpreting historical lighting data and older technical standards involving phot units
- Describing very bright illumination levels such as direct sunlight conditions
Tips & Best Practices
- Ensure consistent measurement conditions when converting illumination units
- Use this conversion primarily for legacy data or when high illuminance needs are involved
- Be aware that phot values may be small decimals for typical indoor lighting levels
- Refer to lighting design codes and historical documentation for unit context
- Confirm unit symbols and definitions before applying conversions
Limitations
- Phot is a non-SI unit less common in current practice
- Conversion mainly serves legacy or specialized lighting contexts
- Typical phot values can be very small for standard indoor illumination
- Precision depends on accurate and consistent unit application
- Not suited for measuring illumination over non-standard or irregular surfaces
Frequently Asked Questions
- What does one lumen/square foot measure?
- One lumen per square foot (lm/ft^2) measures the amount of luminous flux incident on one square foot of surface, often used to specify illuminance in lighting design.
- What is a phot and where is it used?
- The phot is an older, non-SI unit of illuminance equal to one lumen per square centimetre, used historically in lighting and photometry to express very bright illumination levels.
- Why convert from lumen/square foot to phot?
- Conversion helps express illumination in terms suited for high light levels or to interpret older technical documents and standards that used phot units.
Key Terminology
- Lumen per square foot [lm/ft^2]
- A unit measuring illuminance based on lumens incident on one square foot of surface; equivalent to the foot-candle.
- Phot [ph]
- A non-SI unit of illuminance equal to one lumen per square centimetre used historically for high illumination levels.
- Illuminance
- The measure of luminous flux incident per unit area of a surface, indicating brightness.