sealed beam

noun

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.

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Meanings

nounsealed beam (plural sealed beams)

plural sealed beams

  1. engineeringA 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.

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

    1940, Ralph A. Richardson, Optics and Wheels, General Motors Corporation, p. 25

Translations

Finnish umpiovalaisin
  • umpiovalaisintype of lamp
Cite this entry
APA

sealed beam. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/sealed%20beam

MLA

“sealed beam.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/sealed%20beam. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “sealed beam,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/sealed%20beam.

Source: sealed beam on Wiktionary, CC BY-SA 4.0.