Lumen per Square Foot to Phot Conversion
Convert between Lumen per Square Foot and Phot quickly and accurately.
How to Convert Lumen per Square Foot to Phot
Conversion Formula
Example
Convert 15 lm/ft² to ph:
Unit Information
Learn about the illumination units you're converting between
Lumen per Square Foot
lm/ft²
Definition
The Lumen per Square Foot is an imperial unit of illuminance equal to approximately 10.76 lux, representing the luminous flux per square foot. It is commonly used in countries employing the imperial system for lighting design and illuminance measurements.
History/Origin
Developed in countries using imperial units as a practical measure of illuminance. It provides a familiar reference for lighting professionals working with imperial measurements and is commonly used in architectural lighting and building design.
Current Use
Widely used in the United States and other imperial-system countries for lighting design, architectural applications, and general illuminance measurements. It provides a practical unit for lighting professionals and is commonly referenced in building codes and lighting standards.
Multiplier
10.764
Offset
0
Phot
ph
Definition
The Phot is a CGS unit of illuminance equal to 10,000 lux, representing one lumen per square centimeter. It is a larger unit used for measuring very high levels of illumination, particularly in scientific and technical applications where high light intensities are common.
History/Origin
Developed as part of the CGS system of units, where the phot provided a convenient way to express high illumination values. It was widely used in scientific literature and technical applications before the adoption of SI units became standard practice.
Current Use
Primarily found in older scientific literature and specialized technical applications. It provides a practical scale for measuring very bright light sources and is still occasionally referenced in photometric research and historical technical documents.
Multiplier
10000
Offset
0
Lumen per Square Foot to Phot Conversion Table
| Lumen per Square Foot [lm/ft²] | Phot [ph] |
|---|---|
| 1 lm/ft² | 0.001076 ph |
| 10 lm/ft² | 0.010764 ph |
| 25 lm/ft² | 0.02691 ph |
| 50 lm/ft² | 0.05382 ph |
| 100 lm/ft² | 0.107639 ph |
| 0 lm/ft² | 0E+0 ph |
| -10 lm/ft² | -0.010764 ph |
| -40 lm/ft² | -0.043056 ph |
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