Convert Phot to Nox
Use this free converter to change phot (ph) into nox (nx). Phot and nox both measure illuminance. As a quick reference, 1 ph equals 10000000 nx, and 1 nx equals 1.0000e-7 ph.
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Nox (nx)
10000000
1 ph = 10000000 nx
Illuminance conversion table
| Phot | Nox |
|---|---|
| 0.01 | 100000 |
| 0.1 | 1000000 |
| 0.5 | 5000000 |
| 1 | 10000000 |
| 2 | 20000000 |
| 3 | 30000000 |
| 5 | 50000000 |
| 10 | 100000000 |
| 20 | 200000000 |
| 25 | 250000000 |
| 50 | 500000000 |
| 100 | 1000000000 |
| 1,000 | 10000000000 |
How to convert Phot to Nox
Multiply the phot value by 10000000 to get nox.
- Enter the number of phot you want to convert.
- The converter instantly shows the equivalent value in nox.
- Worked example: 15 ph × 10000000 = 150000000 nx.
- Use the swap button to reverse the conversion (nox 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.
Nox (nx)
- Definition
- A nox (nx) is a non-SI unit of illuminance equal to one millilux (0.001 lux), intended for very dim conditions.
- History
- It was proposed in the early 20th century for measuring nighttime light levels but was never officially standardised.
- Current use
- Nox is largely historical; modern low-light measurements use millilux or microlux instead.
Frequently asked questions
How many nox are in a phot?
There are 10000000 nx in 1 ph. To convert, multiply the number of phot by 10000000.
How do I convert phot to nox?
Multiply the phot value by 10000000 to get nox. For example, 10 ph = 100000000 nx.
Is this phot-to-nox 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 |