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Guide To Lamp Bases

A general guide to help with identifying light bulbs.

N.B. images are purely representative and not to scale

Incandescents

ReferencesCap DiameterDescriptionImage
BC/B22/B22d/Ba22d22mmBayonet Cap
SBC/B15/B15d/Ba15d15mmSmall Bayonet Cap
SES/E1414mmSmall Edison Screw
ES/E2727mmEdison Screw Cap
CES/E1212mmCandelabra Edison Screw

Halogens & LEDs

ReferencePin SpacingImage
GU4/MR114mm
GU5.3/MR165.3mm
GU1010mm
G44mm
GY6.356.35mm
G99mm
R7/R7s/RX7s7mm

Fluorescents

ReferencePin SpacingTube TypeTube DiameterImage
T4/G55mmStraight12mm
T5/G55mmStraight15mm
T8/G1313mmStraight25mm
T9/G10qN/ACircular29mm
T12/G1313mmStraight38mm
GR10qN/A2D Compact FluorescentN/A

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