NOTE: This definition was changed in RP-16-17 Addendum 4. Deletions have a strike-through. New text is bold.
Note: This term is generally applied in transportation lighting (for example, automotive headlamps and aircraft landing lights) to distinguish sealed-beam lamps from similar devices in which the light source is replaceable within the reflector‑lens unit.
A reflector lamp in which the outer bulb is formed of two pressed parts that are fused or sealed together; namely, a reflectorized bowl and a cover that may be clear or patterned for optical control and having a non-replaceable light source.
Note 1: The construction of sealed-beam lamps gives a more closely controlled beam of light than ordinary reflector lamps.
Note 3: Sealed-beam lamps are sometimes called pressed reflector lamps or PAR lamps with the same meaning.« Back to Definitions Index