Common Light Bulb Base Sizes – Edison Screw

by Sean O'Hara, AIA, LEED AP on October 30, 2017

When replacing a light bulb, its helpful to know a bit more about it. In addition to knowing the voltage, wattage, color temperature and type of bulb, its also important to know that screw-in type bulbs come in several different diameters. The screw mounts are referred to as the Edison screw fitting, which of course was developed by Thomas Edison.

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The designation for each type is Exx where the xx is the diameter in millimeters. These are the four most common types in the United States:

  • Candelabra: E12
  • Intermediate: E17
  • Standard: E26
  • Mogul: E39

The sizes are slightly different in other countries, but of course the big difference is that the voltage is also different so the bulbs are generally not interchangeable.

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