holophote

[ hol-uh-foht, hoh-luh- ]

Phonetic (Standard)IPA

noun

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

1840–50; back formation from holophotal ( holo- + -photal ); photic, -al ¹

A fixed holophote is placed inside the optic in the dark or landward arc, and at the focal plane of the lamp.

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

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

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