Carbon arc lamp and Footlights

Carbon arc lamp noun - Has carbon electrodes.

Footlights and carbon arc lamp are semantically related. in stage lights topic. In some cases you can use "Footlights" instead a noun phrase "Carbon arc lamp".

Footlights noun - Theater light at the front of a stage that illuminate the set and actors.

Carbon arc lamp and footlights are semantically related. Sometimes you can replace phrase "Carbon arc lamp" with "Footlights", this terms are similar.