Lux to Phot Converter
Convert Lux (lx) to Phot (ph) instantly. 1 lx = 0.0001 ph.
Illuminance Converter
4 units available
1 lx = 0.0001 ph
Formula:
ph = lx × 0.0001With your value: 1 lx = 0.0001 ph
Other Lux to Phot conversions
Lux to Phot Conversion Table
| Lux (lx) | Phot (ph) |
|---|---|
| 0.5 | 5.000000e-5 |
| 1 | 0.0001 |
| 2 | 0.0002 |
| 5 | 0.0005 |
| 10 | 0.001 |
| 15 | 0.0015 |
| 20 | 0.002 |
| 25 | 0.0025 |
| 50 | 0.005 |
| 100 | 0.01 |
| 250 | 0.025 |
| 500 | 0.05 |
| 1000 | 0.1 |
Phot to Lux Conversion Table
| Phot (ph) | Lux (lx) |
|---|---|
| 0.5 | 5,000 |
| 1 | 10,000 |
| 2 | 20,000 |
| 5 | 50,000 |
| 10 | 100,000 |
| 15 | 150,000 |
| 20 | 200,000 |
| 25 | 250,000 |
| 50 | 500,000 |
| 100 | 1,000,000 |
| 250 | 2,500,000 |
| 500 | 5,000,000 |
| 1000 | 10,000,000 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Lux (lx)
Illuminance
Derived from the lux (1 lx = 1 lm/m²); the foot-candle is 1 lm/ft².
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Phot (ph)
Illuminance
Derived from the lux (1 lx = 1 lm/m²); the foot-candle is 1 lm/ft².
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
How to Convert Lux to Phot
To convert from Lux (lx) to Phot (ph), multiply the value by 0.0001.
Formula: ph = lx × 0.0001
Reverse: lx = ph × 10,000
Step-by-Step Example
- Start with your value in Lux. For example: 5 lx
- Multiply by the conversion factor: 5 x 0.0001
- The result is: 0.0005 ph
About Lux
Lux (lx) is the SI unit of illuminance, measuring luminous flux per unit area. It is equal to one lumen per square meter.
Fun Fact: Direct sunlight is about 32,000 to 100,000 lux.
Common uses: lighting design, photography, workspace safety.
About Phot
The phot (ph) is a unit of illuminance. One phot equals 10000 luxs. UnitConvertLab converts it against every other illuminance unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: illuminance calculations, engineering and science, education.
Frequently Asked Questions
How many Phot are in 1 Lux?
There are exactly 0.0001 Phot in 1 Lux. This means the conversion factor from Lux to Phot is 0.0001.
What is the formula to convert Lux to Phot?
The formula to convert Lux to Phot is: ph = lx × 0.0001. For example, to convert 10 Lux to Phot, you would multiply 10 by 0.0001.
What is a Lux?
Lux (lx) is the SI unit of illuminance, measuring luminous flux per unit area. It is equal to one lumen per square meter.
What is a Phot?
The phot (ph) is a unit of illuminance. One phot equals 10000 luxs. UnitConvertLab converts it against every other illuminance unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What are the common uses of Lux?
The Lux is commonly used in lighting design, photography, workspace safety.
Related Illuminance Conversions
Cite this page
UnitConvertLab. (2026). Lux to Phot converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/lux-to-phot