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What Base Is My Light Bulb

What Base Is My Light Bulb

What Base Is My Light Bulb

June 5, 2017

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


Small Bayonet Cap	Bayonet Cap
SBC - B15	BC - B22
15mm Base Diameter	22mm Base Diameter

Screw Cap Bases


Small Eddison Screw Cap	Eddison Screw Cap
SES - E14	ES - E27
14mm Base Diameter	27mm Base Diameter

Pin Bases


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	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	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.

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