Light bulbs come in many bases to fit different light fittings.  The common types of light bulb can be broken down in to groups of bases and are shown here:

Bayonet Cap Bases

 SBC B15 Small Bayonet Cap Base  BC B22 Bayonet Cap Base

Small Bayonet Cap

Bayonet Cap

SBC - B15

BC - B22

15mm Base Diameter

22mm Base Diameter

 

Screw Cap Bases

 SES E14 Small Eddison Screw Base  ES E27 Eddison Screw Base

Small Eddison Screw Cap

Eddison Screw Cap

SES - E14

ES - E27

14mm Base Diameter

27mm Base Diameter

 

Pin Bases

 GU5.3 Base For MR16 LV Reflectors GU4 Base For MR11 Reflectors  GU9 Base For Capsule Lamps  GU10 240v Reflector LED Lamp 

GU5.3 Cap

GU4

GU9

GU10 Cap

MR16 LV reflectors

MR11 LV Reflectors

Capsule lamps

 50mm 230v reflectors

Bi pin – 5.3mm between centre of pins.

Pin dia 1.45-1.6mm

Bi pin – 4mm between centre of pins

Bi pin – 9mm between centre of pins

Bi pin – 10mm between centre of pins.

 

 

 G4 Base For Capsule Lamps G9 Base For Capsule Lamps 

 

G53 Base For AR111 Reflectors 

GX53 Cabinet Lamp 

G4

G9

G53

GX53

Capsule lamps

Capsule lamps

AR111 Reflectors

GX53 Cabinet lighting

Bi pin – 4mm between centre of pins

Bi pin – 9mm between centre of pins

Bi pin – 53mm between centre of pins

Bi pin – 53mm between centre of pins

 

Bases For Tubular Lamps

 R7S Tubular Base  G5 Base For T5 Tubular Lamps / Fluorescent  G13 Base For T8 Tubular Lamps / Fluorescent T12 Fluorescent

R7S

G5

G13

G13

Previously halogen, now LED
equivalent – floodlights,
uplighters

Previously T5 fluorescent,

LED equivalent

Previously T8 fluorescent,

LED equivalent

Previously T12 fluorescent 

78mm and 117mm long

5mm between centre of pins

13mm between centre of pins on 25mm tube

13mm between centre of pins on 38mm tube

 

Bases For Strip Lights

S15 Strip Light Base
S15S
Found on tubular striplights
15mm diameter base4

 

Compact Fluorescent

Compact Fluorescent bases Compact Fluorescent bases 2

 

Have a look in the bulb section of the website to see what types are available and feel free to contact us if you would like more information.