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Light bases and Sockets

There are a large types of lighting bases and sockets. You need to ensure that the right base fits into your light fitting.

Bayonet Cap Light Bases


This is the common push and twist base, which is exists on most regular light bulbs. Its diameter is 22mm ands has two locating lugs.

B22 Bayonet light base
B22 Bayonet


BA15 Bayonet light base
BA15 Bayonet


BA9 Bayonet light base
BA9 Bayonet


Edison Screw Cap Light Base


The Edison bases are screw-ins, with the most popular socket (E27) having a 27mm diameter. The E14 Edison is commonly used for chandeliers and appliances.

E27 Screw light base
E27 Screw


E12 Screw light base
E12 Screw


E14 Screw light base
E14 Screw


E40 Screw light base
E40 Screw


Halogen Capsule Bases


Halogen capsule bases are designated by the number of millimeters between the pins. For example the G4 has pins 4mm apart.

G4 Halogen Capsule Base
G4


GY6.35 Halogen Capsule Base
GY6.35


G9 Halogen Capsule Base
G9


R7 Halogen Capsule Base
R7


Downlight Bases


The most common downlights are push fit (GU4, GU5.3 or GU10). They come in various forms, including halogen and LED.

GU4 Downlight Base
GU4


GU5.3 Downlight Base
GU5.3


GU10 Downlight Base
GU10


Fluoresent Tube Bases


Fluorescent tubes normally have a two-pin fitting at the ends of the tube.

G5 Fluoresent Tube Bases
G5


G13 Fluoresent Tube Bases
G13