1. A unit of illumination equal to one thousandth of a lux, used to measure very low levels of light.
Usage: technical; abbreviation: mlx

Examples

• The camera sensor can detect light levels as low as 0.1 millilux.
• Night vision equipment operates effectively in conditions of just a few millilux.
• The laboratory measured the faint glow at approximately 5 millilux.
• Astronomers use millilux measurements to study starlight in dark sky observations.