Definition of sealed beam in English English dictionary
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
The new Sealed Beam Headlights are designed to maintain substantially their initial efficiency throughout their life.
(Otomotiv) A headlight that usually contains twin high/low filaments, a reflector, and a lens and is sealed to keep out dirt and moisture. When the headlight fails, you replace the entire unit. Sealed beam units are usually found on older vehicles. Newer ones have halogen headlights