Convert Phot to Lux
Use this free converter to change phot (ph) into lux (lx). Phot and lux both measure illuminance. As a quick reference, 1 ph equals 10000 lx, and 1 lx equals 0.0001 ph.
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Lux (lx)
10000
1 ph = 10000 lx
Illuminance conversion table
| Phot | Lux |
|---|---|
| 0.01 | 100 |
| 0.1 | 1000 |
| 0.5 | 5000 |
| 1 | 10000 |
| 2 | 20000 |
| 3 | 30000 |
| 5 | 50000 |
| 10 | 100000 |
| 20 | 200000 |
| 25 | 250000 |
| 50 | 500000 |
| 100 | 1000000 |
| 1,000 | 10000000 |
How to convert Phot to Lux
Multiply the phot value by 10000 to get lux.
- Enter the number of phot you want to convert.
- The converter instantly shows the equivalent value in lux.
- Worked example: 15 ph × 10000 = 150000 lx.
- Use the swap button to reverse the conversion (lux to phot).
About these units
Phot (ph)
- Definition
- A phot (ph) is a CGS unit of illuminance equal to 10,000 lux, or one lumen per square centimeter.
- History
- It was part of the CGS system, predating the SI, and is now largely obsolete.
- Current use
- The phot is rarely used today, appearing only in older technical literature.
Lux (lx)
- Definition
- The lux (lx) is the SI unit of illuminance, equal to one lumen per square meter — a measure of how much light falls on a surface.
- History
- It was adopted as an SI unit in 1960, derived from the lumen and the meter.
- Current use
- Lux is used in lighting design, photography, agriculture (grow-light intensity), and workplace health and safety standards.
Frequently asked questions
How many lux are in a phot?
There are 10000 lx in 1 ph. To convert, multiply the number of phot by 10000.
How do I convert phot to lux?
Multiply the phot value by 10000 to get lux. For example, 10 ph = 100000 lx.
Is this phot-to-lux converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Phot to other illuminance units
| Unit | 1 Phot equals |
|---|---|
| Lux (lx) | 10000 lx |
| Millilux (mlx) | 10000000 mlx |
| Kilolux (klx) | 10 klx |
| Foot-candle (fc) | 929.0304 fc |
| Nox (nx) | 10000000 nx |