sealed beam

sealed beam

English

Noun

sealed beam (plural sealed beams)

1. (technology) A type of electric lamp for producing a beam of light in which the filament is sealed inside a unit consisting of the reflector and lens so as to ensure the alignment of the beam and to protect the reflector from becoming dirty or tarnished.
   • 1940, Ralph A. Richardson, Optics and Wheels, General Motors Corporation, p. 25

     The new Sealed Beam Headlights are designed to maintain substantially their initial efficiency throughout their life.

Translations

type of lamp

Finnish: umpiovalaisin