Convert Lux to Phot
Use this free converter to change lux (lx) into phot (ph). Lux and phot both measure illuminance. As a quick reference, 1 lx equals 0.0001 ph, and 1 ph equals 10000 lx.
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Phot (ph)
0.0001
1 lx = 0.0001 ph
Illuminance conversion table
| Lux | Phot |
|---|---|
| 0.01 | 0.000001 |
| 0.1 | 0.00001 |
| 0.5 | 0.00005 |
| 1 | 0.0001 |
| 2 | 0.0002 |
| 3 | 0.0003 |
| 5 | 0.0005 |
| 10 | 0.001 |
| 20 | 0.002 |
| 25 | 0.0025 |
| 50 | 0.005 |
| 100 | 0.01 |
| 1,000 | 0.1 |
How to convert Lux to Phot
Multiply the lux value by 0.0001 to get phot.
- Enter the number of lux you want to convert.
- The converter instantly shows the equivalent value in phot.
- Worked example: 15 lx × 0.0001 = 0.0015 ph.
- Use the swap button to reverse the conversion (phot to lux).
About these units
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.
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.
Frequently asked questions
How many phot are in a lux?
There are 0.0001 ph in 1 lx. To convert, multiply the number of lux by 0.0001.
How do I convert lux to phot?
Multiply the lux value by 0.0001 to get phot. For example, 10 lx = 0.001 ph.
Is this lux-to-phot 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 Lux to other illuminance units
| Unit | 1 Lux equals |
|---|---|
| Millilux (mlx) | 1000 mlx |
| Kilolux (klx) | 0.001 klx |
| Foot-candle (fc) | 0.09290304 fc |
| Phot (ph) | 0.0001 ph |
| Nox (nx) | 1000 nx |