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Filament designation
The configuration of the filaments in all tungsten filament lamps is identified by a prefix letter or
letters, followed by a number. The letter indicates whether the wire is a single coil (C) or coiled coil
(CC); the number indicates the form or arrangement of the coil on its support structure. Note that the
illustrations are not to scale.
Planar (MP) C13
Biplanar (BP) C13d
C2V
C7A
C9
Monoplane
Biplane
2C8 2CC8
C6 Oval
CC6 (Reflector)
CC8 (Reflector)
C6 CC6
C8 CC8
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GE LIGHTING - ENTERTAINMENT LIGHTING CATALOGUE
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