microlux
/ˈmaɪkroʊˌlʌks/
noun
- A unit of illumination equal to one millionth of a lux, used to measure very low light levels.
- The camera can capture images in conditions as dim as 0.01 microlux.
- The sensor detected a light level of only 5 microlux in the deep cave.
- Astronomers measure the faint light from distant stars in microlux.