Lamp Guide: Incandesent

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