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bulb

I have a screw thread lightbulb where the thread is 11.5 mm across - would that be likely to be E11 or E12? Or something else? Thanks.

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The E26 and E27 are usually interchangeable, as are the E39 and E40, because there is only a 1 mm difference in thread outside diameter. E11 and E12 are not interchangeable.

The E11 base is sometimes used for 50/75/100-watt halogen lights in North America, where it is called the "mini-can", and tighter threads are used to keep them out of E12-base nightlights and other places where they could start a fire.[citation needed]

Thank you, Wikipedia.

So E11 is a thing, it is used for high intensity halogens. That bulb is a common night light or festoon (Christmas style string) light, so it will be E12.

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Presumably E12 since it rounds to 12 mm and E12 is a more common size. See this: https://www.12vmonster.com/blogs/product-questions/edison-screw-types

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