[ hol-uh-foht, hoh-luh- ]
/ ˈhɒl əˌfoʊt, ˈhoʊ lə- /
an apparatus by which practically all the light from a lighthouse lamp or the like is thrown in a desired direction.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for holophote
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.