source of illumination

1. 1.

   any device serving as a source of visible electromagnetic radiation

   Broaderdevice

   Narrowerlamplightultraviolet lamp

Questions about source of illumination

What does source of illumination mean?

source of illumination means "any device serving as a source of visible electromagnetic radiation".

Is source of illumination a common word?

source of illumination is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.