First light and Half-light

First light noun - The first light of day.

Half-light and first light are semantically related. in daybreak topic. In some cases you can use "Half-light" instead a noun phrase "First light".

Half-light noun - A greyish light (as at dawn or dusk or in dim interiors).

First light and half-light are semantically related. Sometimes you can replace phrase "First light" with "Half-light", this phrases are similar.