Phot (ph)
The phot (ph) equals 10,000 lux — a CGS unit of illuminance (one lumen per square centimeter).
Phots appear in older photometry and optical engineering references alongside lux and foot-candle.
Phot to Lux
Convert phot to lux instantly. Type in either field — results update live.
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illumination Phot Lux
1 phot = 10,000 luxs
Unit
Unit
Conversion table
Selected ph values converted to lx using the exact factor from this tool.
| ph | lx |
|---|---|
| 0.01 | 100 |
| 0.1 | 1,000 |
| 1 | 10,000 |
| 2 | 20,000 |
| 3 | 30,000 |
| 5 | 50,000 |
| 10 | 100,000 |
| 20 | 200,000 |
| 50 | 500,000 |
| 100 | 1,000,000 |
| 1,000 | 10,000,000 |
How to convert
Exact conversion factors in both directions, plus a worked example.
1 ph = 10000 lx
1 lx = 0.0001 ph
To convert phot to lux, multiply by 10000.
To convert lux to phot, multiply by 0.0001.
Example: convert 10 ph to lx
10 × 10000 = 100000 lx
About these units
Short background on the units used in this conversion.
Lux (lx)
The lux (lx) is the SI unit of illuminance — one lumen of luminous flux per square meter on a surface.
Lux measures workplace lighting levels, photography exposure planning, and building-code minimum illuminance requirements.
Frequently asked questions
How many luxs are in one phot?
One phot equals 10,000 luxs. Multiply your phots value by 10,000 to convert to luxs.
What is the conversion formula?
lx = ph × 10,000The reverse is
ph = lx × 0.0001, using the same exact factors as this converter.Is this Phot to Lux converter private?
Yes. All calculations run locally in your browser. Nothing you type is sent to a server.