Can I Detect Units in Shadow/Shade?

[thecoolsideofthepillow 22]

Probably a stupid question: Can I detect any/all units being in the shade/a shadow? My gut says no, but maybe my gut is wrong. I searched but didn't find anything, though I often get told later something that would work that just didn't match my search query.

[Icaruk 14]

Little Inmersion Tweaks uses moonIntensity + another thing I can't rembember.