タイトルまたは説明
A sealed beam is a type of lamp that includes a reflector and
filament as a single assembly, over which a front cover (lens),
usually of clear glass, is permanently attached.Sealed beams come
in various voltages, most commonly 6, *2, *8, and **0 V. Aircraft
landing lights, which are commonly used in the open-air, concerts
and stage lighting, are sealed beams that have a very narrow beam
spread.Modern sealed beams have an additional envelope around the
filament, whereas older types do not.Headlights for automobiles may
be of the sealed beam type. It means that the reflectors array on
the front and the bulbs are a unit and must be replaced together in
case of burnt out.In theatrical lighting, sealed beam type fixtures
are often used. A common size, which used in rock concerts, as well
as outdoor architectural lighting, is the Parabolic Aluminum
Reflector *4 (PAR*4). The PAR is a non-SI unit of measure equal to
one eighth of an inch, so a PAR*4 light is a light which is 8
inches in diameter. The fixtures that such sealed beam lights go
into are called "PAR cans", so a PAR*4 fixture is an 8 inch
diameter can.Other popular sizes are PAR*6, PAR*8, and PAR*6.
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