Incandescent Filament Designations

Filament
designations consist of a letter or letters to indicate how the
wire is coiled, and an arbitrary number sometimes followed by a
letter to indicate the arrangement of the filament on the supports.
Prefix letters include C (coil) — Wire is would into a helical
coil or may be deeply fluted; CC (coiled coil) — wire is would
into a helical coil and this coiled wire again wound into a helical
coil. some of the more commonly used types of filament arrangements
are illustrated.

C-2V
CC-2V
C-5 C-6
CC-6
CC-6 C-7A C-8
2CC-8 C-9 C-11
CC-11
C-13
CC-13
C-17A C-2R
CC-2R
MP BP FF M SC CC-6
CC-8

Incandescent Base Types

Incandescent Base Types

Incandescent Base Types

Incandescent Bulb Shapes

The size and shape of a bulb is designated by a letter or letters
followed by a number. The letter indicates the shape of the bulb
while the number indicates the diameter of the bulb in eighths of
an inch. For example “T-10” indicates a tubular shaped bulb having
a diameter of 10/8 or 1 1/4 inches. The following illustrations
show some of the more popular bulb shapes and sizes.

A B BA
Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes
A-19 A-21 A-23 B-10 1/2 B-13 BA-9 BA-9 1/2
BR C ER
Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes
BR-19 BR-25 BR-30 BR-40 C-7 ER-30
F G K P
Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes
F-10 F-15 F-20 G-16 1/2 G-25 G-40 K-19 P-25
PAR PS
Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes
PAR-16 PAR-20 PAR-30S PAR-30L PAR-36 PAR-38 PAR-64 PAR-64 PS-35
R RP S
Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes
R-20 R-30 R-40 R-40 RP-11 S-6 S-11 S-14
T
Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes Incandescent Bulb Shapes
T-4 1/2 T-5 T-6 T-8 T-8 T-10
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