Convert Nox to Phot
Use this free converter to change nox (nx) into phot (ph). Nox and phot both measure illuminance. As a quick reference, 1 nx equals 1.0000e-7 ph, and 1 ph equals 10000000 nx.
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Phot (ph)
1.0000e-7
1 nx = 1.0000e-7 ph
Illuminance conversion table
| Nox | Phot |
|---|---|
| 0.01 | 1.0000e-9 |
| 0.1 | 1.0000e-8 |
| 0.5 | 5.0000e-8 |
| 1 | 1.0000e-7 |
| 2 | 2.0000e-7 |
| 3 | 3.0000e-7 |
| 5 | 5.0000e-7 |
| 10 | 0.000001 |
| 20 | 0.000002 |
| 25 | 0.0000025 |
| 50 | 0.000005 |
| 100 | 0.00001 |
| 1,000 | 0.0001 |
How to convert Nox to Phot
Multiply the nox value by 1.0000e-7 to get phot.
- Enter the number of nox you want to convert.
- The converter instantly shows the equivalent value in phot.
- Worked example: 15 nx × 1.0000e-7 = 0.0000015 ph.
- Use the swap button to reverse the conversion (phot to nox).
About these units
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.
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 nox?
There are 1.0000e-7 ph in 1 nx. To convert, multiply the number of nox by 1.0000e-7.
How do I convert nox to phot?
Multiply the nox value by 1.0000e-7 to get phot. For example, 10 nx = 0.000001 ph.
Is this nox-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 Nox to other illuminance units
| Unit | 1 Nox equals |
|---|---|
| Lux (lx) | 0.001 lx |
| Millilux (mlx) | 1 mlx |
| Kilolux (klx) | 0.000001 klx |
| Foot-candle (fc) | 0.00009290304 fc |
| Phot (ph) | 1.0000e-7 ph |