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How to Convert from Lux [lx] to Phot [ph]
Easily convert illumination values from lux (lx) to phot (ph), bridging modern SI units and older photometric measures for lighting design and analysis.
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Lux [lx] to Phot [ph] Conversion Table
| Lux [lx] | Phot [ph] |
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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.
| Lux [lx] | Phot [ph] |
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What Is This Tool?
This converter transforms illuminance values measured in lux (lx), the SI derived unit, into phot (ph), a larger, historical unit of brightness used in specific lighting contexts.
How to Use This Tool?
- Enter the illuminance value in lux into the input field.
- Select 'lux' as the original unit and 'phot' as the target unit.
- Click convert to view the equivalent value expressed in phot.
Key Features
- Converts illuminance from lux to phot accurately using established conversion rates.
- Supports understanding of values used in both modern and legacy lighting documentation.
- Browser-based and straightforward to use for lighting design, photography, and engineering.
Examples
- 500 lux converts to 0.05 phot using the formula 500 × 0.0001 = 0.05 phot.
- 10,000 lux equals 1 phot following 10,000 × 0.0001 = 1 phot.
Common Use Cases
- Describing very bright lighting such as direct sunlight in phot units.
- Interpreting historical lighting tables and photographic exposure charts that use phot.
- Facilitating comparison between newer SI lux standards and older lighting measurements.
Tips & Best Practices
- Use this tool to align modern illuminance data with older documents utilizing phot units.
- Apply the converter when working with high illumination levels for clarity.
- Be cautious when converting very low lux values due to the large difference in unit scale.
Limitations
- The phot unit is non-SI and mostly outdated, mainly relevant for legacy references.
- Conversions can be less intuitive for small lux values due to scaling differences.
- Precision may be reduced when dealing with low illuminance because of the conversion factor.
Frequently Asked Questions
- What is the relationship between lux and phot?
- One lux equals 0.0001 phot; phot is an older unit measuring illuminance at a larger scale.
- Why convert lux to phot?
- To express very high illumination or interpret historical lighting data that uses phot units.
- Is phot still commonly used?
- No, the phot is largely deprecated and mainly used for legacy documentation and specialized scenarios.
Key Terminology
- Lux [lx]
- An SI derived unit of illuminance, representing luminous flux per square meter weighted by human daylight vision.
- Phot [ph]
- A non-SI unit of illuminance equal to one lumen per square centimeter, used historically for very bright light measurements.