Phots to Lux Converter ph → lx
1 phot (ph) = 10,000 lux (lx). Type a value below — the conversion happens instantly, entirely on your device.
1 ph = 10000 lx
1 phots = 10000 lux
1 × 10000 = 10000
1 ph equals 10000 lx, so multiplying by 10000 converts the value. The result describes the exact same quantity — only the measuring stick changes.
How to convert phots to lux
lux = phots × 10,000 — multiply the phot value by 10,000.
Example: 10 ph = 100,000 lx.
To convert the other way: phots = lux ÷ 10,000
Phots to Lux conversion table
| Phots (ph) | Lux (lx) |
|---|---|
| 0.1 | 1000 |
| 0.25 | 2500 |
| 0.5 | 5000 |
| 1 | 10,000 |
| 2 | 20,000 |
| 3 | 30,000 |
| 4 | 40,000 |
| 5 | 50,000 |
| 6 | 60,000 |
| 7 | 70,000 |
| 8 | 80,000 |
| 9 | 90,000 |
| 10 | 100,000 |
| 15 | 150,000 |
| 20 | 200,000 |
| 25 | 250,000 |
| 30 | 300,000 |
| 40 | 400,000 |
| 50 | 500,000 |
| 75 | 750,000 |
| 100 | 1,000,000 |
| 250 | 2,500,000 |
| 500 | 5,000,000 |
| 1000 | 10,000,000 |
About the units
What is a phot?
The CGS unit of illuminance — one lumen per square centimetre, equal to 10,000 lux. Rarely used today outside older optics literature.
What is a lux?
The SI unit of illuminance — one lumen per square metre. A brightly lit office is about 500 lux; direct sunlight can exceed 100,000 lux.
Frequently asked questions
How many lux are in 1 phot?
1 phot (ph) = 10,000 lux (lx).
What is the formula to convert phots to lux?
lux = phots × 10,000 — multiply the phot value by 10,000.
How do I convert ph to lx without a calculator?
Multiply by 10,000 for a close estimate. Exact factor: 1 ph = 10,000 lx.
Is this ph-to-lx converter accurate and private?
Yes. It uses the exact internationally defined conversion factors and computes results locally in your browser — your input is never sent to a server, and the page keeps working offline.