(For example, E12 has a diameter o Approx. 12mm.)
There are four common sizes of screw-in sockets used for line-voltage lamps
- Mutual Replaced By or usually well known to call : 1449 52,258,428,432,1446,1447
Candelabra E12 North America / E11 in Europe
The E11 base is sometimes used for expensive 50/75/100-watt halogen lights in North America, where it is called the “mini-can”, and tighter threads are apparently used to keep them out of E12-base nightlights and other places where they could start a fire.
Intermediate: E17 North America / E14 Europe
Large outdoor Christmas lights use an intermediate base, as do some desk lamps and many microwave ovens.
Medium or Standard E26 North America / E27 Europe
E26/E27 12V are also produced for recreational vehicles
Mogul: E39 North America, E40 in Europe
** Other Applications:
In countries which use 220–240 volts AC domestic power, E27 and E14 are the most common sizes, although the bayonet mount is also used. In 120-volt North America and 100-volt Japan, the standard size for general-purpose lamps is E26.