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Base
E27 Edison Screw
  • The E27 base has a diameter of 27mm
  • Developed by Thomas Edison, hence taking the name Edison Screw
  • The E27 base lamp is widely used throughout the world
B22 Bayonet Cap
  • The B22d base has a diameter of 22mm, and two pins that are perpendicular to the base
GU10 Mains Voltage Halogen
  • GU10 based lamps, have two pins on the base which are 10mm apart
  • Very popular
  • LED versions now available
GU5.3 MR16 Low Voltage Halogen
  • Lamps with a GU5.3 base have two sharp pins on the base
  • The two pins are 5.3mm apart
  • These are low voltage halogen lamps with a 50mm diameter
GU4 Low Voltage Halogen
  • Lamps with a GU4 base have two sharp pins on the base
  • The two pins are 4mm apart
  • These are low voltage halogen lamps with a 35mm diameter
G4 Low Voltage Halogen
  • Lamps with a G4 base have two sharp pins on the base
  • The two pins are 4mm apart
  • These are low voltage capsule halogen lamps
GY6.35 Low Voltage Halogen
  • Lamps with a GY6.35 base have two sharp pins on the base
  • The two pins are 6.35mm apart
  • These are low voltage capsule halogen lamps
G23 2 Pin Compact Fluorescent
  • G23 2 Pin Compact Fluorescent lamps have a single turn tube
  • Popular lamps are Osram Dulux S, Philips PL-S 2 Pin, GE Biax S
G24 d1 d2 d3 2 Pin Compact Fluorescent
  • G24 2 Pin Compact Fluorescent lamps
  • Popular lamps are Osram Dulux D, Philips PL-C 2 Pin, GE Biax D
G5 T5 Fluorescent Tube
  • T5 fluorescent tubes have a G5 base
  • The two brass pins on the end of the tube have a spacing of 5mm, hence the name G5
  • T5 tubes have a diameter of 16mm
G13 T8 Fluorescent Tube
  • T8 fluorescent tubes have a G13 base
  • The two brass pins on the end of the tube have a spacing of 13mm, hence the name G13
  • T8 tubes have a diameter of 26mm
2G7 4 Pin Compact Fluorescent
  • 2G7 4 Pin Compact Fluorescent lamps have a single turn tube
  • Popular lamps are Osram Dulux S/E, Philips PL-S 4 Pin, GE Biax S/E
G12 Metal Halide
  • G12 based lamps, are compact metal halide lamps
  • Popular lamps are the Osram HQI-T, Osram HCI-T, and the Philips CDM-T lamp
G53 Low Voltage Halogen
  • Lamps with a G53 base have two connecting points on the base
  • These are low voltage halogen reflector lamps with a 111mm diameter