Most lamps have metal bases that fit in a
socket to support the lamp and conduct current to the filament wires/LED.
And
lamps bases can be divided into screw base, bayonet base, pin base, shell base
and prefocus base and others.
The
following chart is made to facilitate your purchase of light bulbs by giving a
brief review of all kinds of bases.
|
Screw
base
|
Bayonet base
|
Pin base
|
Prefocus base
|
Other
|
|
E5
|
BA7
|
Fc2
|
PGJ5
|
R7s
|
|
E10
|
B8.4d & BX8.4d
|
Fa4
|
P11.5d
|
RX7s
|
|
EP10
|
BA9
|
Fa6
|
PG12 & PGX12
|
R17d
|
|
EY10
|
BAX9s
|
Fa8
|
PGZ12
|
SX4s/4
|
|
EZ10
|
BAY9s
|
G1.27 & GX1.27
|
PG13 & PGJ13
|
SY4s/7
|
|
E11
|
BAZ9s
|
G2.54& GX2.54
|
P13.5s
|
S5.7s
|
|
E12 *
|
B15d
|
GUX2.5d, GUY2.5d
& GUZ2.5d
|
PX13.5s
|
SX6s
|
|
E14
|
BA15
|
G3.17
|
P14.5s
|
SV7
|
|
E17 *
|
BAU15
|
G4
|
P18s
|
SV8.5
|
|
E26 *
|
BAW15
|
GU4
|
W2.5x16
|
S14
|
|
E26d *
|
BAX15d
|
GY4
|
WU2.5x16
|
S15s & S19s
|
|
E26 / 50x39
& E26 / 51x39 *
|
BAY15d
|
GZ4
|
WX2.5x16
|
SK15s
|
|
E27
|
BAZ15
|
G5
|
WY2.5x16
|
W2x4.6d
|
|
E27 / 51x39
|
BA15s-3 (100° / 130°)
|
G5.3
|
WZ2.5x16
|
W2.1x9.5d
|
|
E39 *
|
BA20
|
G5.3-4.8
|
W3x16d & WX3x16d
|
W3.3x10.4d
|
|
E40
|
BA21-3 (120°)
|
GU5.3
|
W3x16q, WX3x16q &
WY3x16q
|
WP4x9d
|
|
|
B22d
|
GX5.3
|
WZ3x16q
|
W4.3x8.5d
|
|
|
b22d-3 (90° / 135°) /
25x26
|
GY5.3
|
|
W10.6x8.5d
|
|
Attn: the star mark(*) means the base is not allowed to use in China
|
BY22d
|
G6.35, GX6.35 &
GY6.35
|
|
X511
|
|
GU10
|
GZ6.35
|
|
Flashcube / Cube
Flashcube
|
|
GU10q
|
GU6.5
|
|
Magicube Type X
|
|
|
GX10
|
2G7
|
|
|
|
|
GX10q
|
GU7
|
|
|
|
|
GY10
|
2GX7
|
|
|
|
|
GY10q
|
GZX7d, GZY7d &
GZZ7d
|
|
|
|
|
GZ10
|
G7.9 & GX7.9
|
|
|
|
|
GZ10q
|
2G8
|
|
|
|
|
2G10
|
GR8
|
|
|
|
|
2G11
|
G8.5
|
|
|
|
|
G12
|
GX8.5
|
|
|
|
|
GX12
|
G9
|
|
|
|
|
G13
|
G9.5
|
|
|
|
|
2G13
|
GX9.5
|
|
|
|
|
2GX13
|
GY9.5, GZ9.5, GZX9.5,
GZY9.5 & GZZ9.5
|
|
|
|
|
G16d
|
G10q
|
|
|
|
|
G16t
|
GR10q
|
|
|
|
|
GU16d / GX16d
|
GRX10q
|
|
|
|
|
GY16
|
GRZ10d
|
|
|
|
|
G17q-7, GX17q-7 &
GY17q-7
|
GRZ10t
|
|
|
|
|
G17.5t-1
|
PG18.5d
|
|
|
|
|
G20
|
PGJ19
|
|
|
|
|
G22
|
PGJY19
|
|
|
|
|
GY22
|
P20d, PX20d, PY20d
& PZ20d
|
|
|
|
|
G23
|
PG20 & PGU20
|
|
|
|
|
GX23
|
P22d & PX22d
|
|
|
|
|
G24, GX24 & GY24
|
PG22-6.35
|
|
|
|
|
G32, GX32 & GY32
|
PK22s
|
|
|
|
|
G38
|
PKX22s
|
|
|
|
|
GX38q
|
P23t
|
|
|
|
|
G53
|
P26s
|
|
|
|
|
GX53
|
PX26d
|
|
|
|
|
|
P26.4t & PJ26.4t
|
|
|
|
|
|
P28s
|
|
|
|
|
|
P29t
|
|
|
|
|
|
P30s-10.3
|
|
|
|
|
|
P32d & PK32d
|
|
|
|
|
|
P36
|
|
|
|
|
|
P38s
|
|
|
|
|
|
P38t
|
|
|
|
|
|
P40s
|
|
|
|
|
|
P43t
|
|
|
|
|
|
PX43t
|
|
|
|
|
|
PY43d
|
|
|
|
|
|
PZ43t
|
|
|
|
|
|
P45t
|
|
|
|
|
|
P46s
|
|
|
Sources: GB2797-200×
|
