Trade Lead Description:
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.
A burnt-out sealed beam, broken open to show internals. When the lamp burns out the whole assembly (reflector, lamp, lens array) must be replaced. The advantage is very good alignment, and being completely impervious to dirt, moisture, etc
In theatrical lighting, sealed beam type fixtures are often used. A common size, also used in rock concerts, as well as outdoor architectural lighting, is the Parabolic Aluminum Reflector 64 (PAR64). The PAR is a non-SI unit of measure equal to one eighth of an inch, so a PAR64 light is a light that's 8 inches in diameter. The fixtures that such sealed beam lights go into are called "PAR cans", so a PAR64 fixture is an 8 inch diameter can.
Other popular sizes are PAR56, PAR38, and PAR36.
Posted from China - Jiangxi on 20 March, 2006
Last Modified on 21 April, 2006
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