bulb base type

A look at the different base types available in light bulbs

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There are unfortunately hundreds of different bases for light bulbs. Most of them fall into similar styles, but they can vary quite dramatically. There are in fact so many different bases, that I have witnessed lighting professionals who have worked in the industry their whole life come across bulbs they have never seen before. That being said, the majority of bulbs now fall into just a few categories, and can be easily purchased and replaced, once you know what you are looking for.

The most common light bulb base type is an E26, also called a medium base. This is the standard base used in lamps and fixtures for traditional 60-watt incandescent bulbs. Note however, that LED equivalents work just fine in any of these bases, and have a lot of cost- benefit. Probably the next most popular base is the E12 or candelabra base. These are the lights that go in chandeliers, and are typically shaped like missiles or flames.

Candelabra: E12 North America, E11 in Europe.
Intermediate: E17 North America, E14 (Small ES, SES) in Europe.
Medium or standard: E26 (MES) in North America, E27 (ES) in Europe.
Mogul: E39 North America, E40 (Goliath ES) in Europe.