Phots to Millilux Converter
Enter the illumination in phots below to convert it to millilux.
Convert Phots to Millilux
Enter a value in phots (ph) to convert to millilux (mlx).
Phot to Millilux Conversion Table
Table showing various phot measurements converted to millilux. Click any preset value or arrow to load it into the converter.
How to Convert Phots to Millilux
To convert phots to millilux, multiply the illumination by the following conversion ratio: 10,000,000 millilux/phot.
Since one phot is equal to 10,000,000 millilux, you can use this simple formula to convert:
The illumination in millilux is equal to the illumination in phots multiplied by 10,000,000.
For example, here's how to convert 5 phots to millilux using the formula above.
How Many Millilux Are in a Phot?
There are 10,000,000 millilux in a phot, which is why we use this value in the formula above.
Our phot to millilux calculator automatically converts your illumination measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Phots and millilux are both units used to measure illumination. Keep reading to learn more about each unit.
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. [1]
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.
What Is a Millilux?
A millilux is a unit of illumination equal to 1/1,000 of a lux (0.001 lx). Low-light starlight/moonlight illuminance unit (0.001 lx). [2]
The millilux is classified as a metric and SI-compatible unit of illumination. Millilux can be abbreviated as mlx; for example, 1 millilux can be written as 1 mlx.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millilux (mlx) a convenient decimal multiple of the lux (lx).
In practice, millilux (mlx) 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 phots (ph) and millilux (mlx), keep full floating-point precision (1 ph = 10,000,000 mlx; 1 mlx = 0.0000001 ph) during intermediate calculations and round only the final millilux figure to match your instrument tolerance.
More Phot & Millilux Conversions
Need to calculate in the opposite direction? Use our millilux to phots calculator to switch your starting unit immediately. You can also explore related tools such as converting millilux to phots, converting lux to millilux, or converting lux to kilolux.
Convert from Phots
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Illumination Metrology Standard — Phots (ph) to Millilux (mlx)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Phot (lm/cm²) (ph) & Millilux (mlx)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (ph to mlx)