Lux to Nox Converter
Enter the illumination in lux below to convert it to nox.
Convert Lux to Nox
Enter a value in lux (lx) to convert to nox (nx).
Lux to Nox Conversion Table
Table showing various lux measurements converted to nox. Click any preset value or arrow to load it into the converter.
How to Convert Lux to Nox
To convert lux to nox, multiply the illumination by the following conversion ratio: 1,000 nox/lux.
Since one lux is equal to 1,000 nox, you can use this simple formula to convert:
The illumination in nox is equal to the illumination in lux multiplied by 1,000.
For example, here's how to convert 5 lux to nox using the formula above.
How Many Nox Are in a Lux?
There are 1,000 nox in a lux, which is why we use this value in the formula above.
Our lux to nox calculator automatically converts your illumination measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Lux and nox are both units used to measure illumination. Keep reading to learn more about each unit.
What Is a Lux?
SI derived unit of illuminance (1 lumen per square meter). It serves as a primary reference unit for measuring illumination across scientific and practical applications. [1]
The lux is classified as an International System of Units (SI) unit of illumination. Lux can be abbreviated as lx; for example, 1 lux can be written as 1 lx.
As the primary coherent reference unit for illumination in this category, all other illumination units are mathematically anchored to the lux (lx).
In practice, lux (lx) are widely used across standard illumination applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
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). [2]
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.
When converting illumination between lux (lx) and nox (nx), keep full floating-point precision (1 lx = 1,000 nx; 1 nx = 0.001 lx) during intermediate calculations and round only the final nox figure to match your instrument tolerance.
More Lux & Nox Conversions
Need to calculate in the opposite direction? Use our nox to lux calculator to switch your starting unit immediately. You can also explore related tools such as converting nox to lux, converting lux to kilolux, or converting lux to millilux.
Convert from Lux
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Illumination Metrology Standard — Lux (lx) to Nox (nx)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Lux (lx) & Nox (nx)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (lx to nx)