Luminous flux unit and Light unit

Luminous flux unit noun - A measure of luminous flux per unit area.

Light unit and luminous flux unit are semantically related. In some cases you can use "Light unit" instead a noun phrase "Luminous flux unit".

Light unit noun - A measure of the visible electromagnetic radiation.

Luminous flux unit and light unit are semantically related. Sometimes you can replace phrase "Luminous flux unit" with "Light unit", this phrases are similar.