Nox to Phots Converter
Enter the illumination in nox below to convert it to phots.
Convert Nox to Phots
Enter a value in nox (nx) to convert to phots (ph).
Nox to Phot Conversion Table
Table showing various nox measurements converted to phots. Click any preset value or arrow to load it into the converter.
| Nox (nx) | Phots (ph) |
|---|---|
| 1 nx | 0.0000001 ph |
| 10 nx | 0.000001 ph |
| 100 nx | 0.00001 ph |
| 1,000 nx | 0.0001 ph |
| 10,000 nx | 0.001 ph |
| 100,000 nx | 0.01 ph |
| 1,000,000 nx | 0.1 ph |
| 5,000,000 nx | 0.5 ph |
| 10,000,000 nx | 1 ph |
| 25,400,000 nx | 2.54 ph |
How to Convert Nox to Phots
To convert nox to phots, multiply the illumination by the following conversion ratio: 0.0000001 phots/nox.
Since one nox is equal to 0.0000001 phots, you can use this simple formula to convert:
The illumination in phots is equal to the illumination in nox multiplied by 0.0000001.
For example, here's how to convert 5 nox to phots using the formula above.
How Many Phots Are in a Nox?
There are 0.0000001 phots in a nox, which is why we use this value in the formula above.
Our nox to phot calculator automatically converts your illumination measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Nox and phots are both units used to measure illumination. Keep reading to learn more about each unit.
What Is a Nox?
A nox is a unit of illumination equal to 1/1,000 of a lux (0.001 lx). Dark-adapted illuminance unit equal to 1 millilux (0.001 lx). [1]
The nox is classified as a metric and SI-compatible unit of illumination. Nox can be abbreviated as nx; for example, 1 nox can be written as 1 nx.
When working with nox (nx) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, nox (nx) are widely used across fine-tolerance laboratory, analytical, and micro-scale illumination measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is a Phot?
A phot is a unit of illumination equal to 10,000 lux (lx), the base unit for illumination. CGS illuminance unit equal to 10,000 lux. [2]
The phot is classified as a metric and SI-compatible unit of illumination. Phots can be abbreviated as ph; for example, 1 phot can be written as 1 ph.
When working with phots (ph) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, phots (ph) are widely used across large-scale industrial, bulk, and macro-level illumination specifications within SI metric workflows, engineering documentation, and technical data sheets.
When converting illumination between nox (nx) and phots (ph), keep full floating-point precision (1 nx = 0.0000001 ph; 1 ph = 10,000,000 nx) during intermediate calculations and round only the final phot figure to match your instrument tolerance.
More Nox & Phot Conversions
Need to calculate in the opposite direction? Use our phots to nox calculator to switch your starting unit immediately. You can also explore related tools such as converting phots to nox, converting lux to kilolux, or converting kilolux to lux.
Convert from Nox
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Illumination Metrology Standard — Nox (nx) to Phots (ph)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Nox (nx) & Phot (lm/cm²) (ph)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (nx to ph)