Light source and Source of illumination

Light source noun - Any device serving as a source of illumination.

Source of illumination and light source are semantically related. In some cases you can use "Source of illumination" instead a noun phrase "Light source".

Source of illumination noun - Any device serving as a source of visible electromagnetic radiation.

Light source and source of illumination are semantically related. Sometimes you can replace phrase "Light source" with "Source of illumination", this phrases are similar.