holophote

holophote [hol-uh-foht, hoh-luh-] ExamplesWord Origin noun

1. an apparatus by which practically all the light from a lighthouse lamp or the like is thrown in a desired direction.

Origin of holophote 1840–50; back formation from holophotal (holo- + -photal); see photic, -al1 Examples from the Web for holophote Historical Examples of holophote

The focus observer is shown on the lamp in holophote, Fig. 172.

Torpedoes and Torpedo Warfare

C. W. Sleeman

The catadioptric lens, or holophote, gives a far more powerful but a more concentrated beam than the parabolic reflector.

Torpedoes and Torpedo Warfare

C. W. Sleeman