Millilux to Phots Converter
Enter the illumination in millilux below to convert it to phots.
Convert Millilux to Phots
Enter a value in millilux (mlx) to convert to phots (ph).
Millilux to Phot Conversion Table
Table showing various millilux measurements converted to phots. Click any preset value or arrow to load it into the converter.
| Millilux (mlx) | Phots (ph) |
|---|---|
| 1 mlx | 0.0000001 ph |
| 10 mlx | 0.000001 ph |
| 100 mlx | 0.00001 ph |
| 1,000 mlx | 0.0001 ph |
| 10,000 mlx | 0.001 ph |
| 100,000 mlx | 0.01 ph |
| 1,000,000 mlx | 0.1 ph |
| 5,000,000 mlx | 0.5 ph |
| 10,000,000 mlx | 1 ph |
| 25,400,000 mlx | 2.54 ph |
How to Convert Millilux to Phots
To convert millilux to phots, multiply the illumination by the following conversion ratio: 0.0000001 phots/millilux.
Since one millilux is equal to 0.0000001 phots, you can use this simple formula to convert:
The illumination in phots is equal to the illumination in millilux multiplied by 0.0000001.
For example, here's how to convert 5 millilux to phots using the formula above.
How Many Phots Are in a Millilux?
There are 0.0000001 phots in a millilux, which is why we use this value in the formula above.
Our millilux to phot calculator automatically converts your illumination measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Millilux and phots are both units used to measure illumination. Keep reading to learn more about each unit.
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). [1]
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.
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 millilux (mlx) and phots (ph), keep full floating-point precision (1 mlx = 0.0000001 ph; 1 ph = 10,000,000 mlx) during intermediate calculations and round only the final phot figure to match your instrument tolerance.
More Millilux & Phot Conversions
Need to calculate in the opposite direction? Use our phots to millilux calculator to switch your starting unit immediately. You can also explore related tools such as converting phots to millilux, converting millilux to lux, or converting lux to kilolux.
Convert from Millilux
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Illumination Metrology Standard — Millilux (mlx) to Phots (ph)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Millilux (mlx) & Phot (lm/cm²) (ph)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (mlx to ph)