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Base

The base is the part of a light source that is inserted into or screwed into the socket of a light fixture.  It holds the light source in place and also serves as the interface for the electrical current. The base must fit the socket exactly; otherwise, it is impossible to insert the light source into the fixture. This prevents the use of incorrect light sources, which is important because high- and low-voltage bulbs often look similar but operate at different voltages.  To ultimately find the right base for the socket, the various base types are described using letters and a combination of numbers. The letters indicate the type of attachment. For example, “E” stands for a screw thread for the Edison socket, “G” for a plug-in base with at least two protruding contacts, and “B” for a bayonet base. The numbers then indicate the distance between the contacts. This simple process of screwing in or plugging together the socket and base also makes replacement very easy, since conventional discharge lamps and incandescent bulbs have only a limited lifespan. Therefore, if a bulb burns out, it is possible to quickly install a new one.

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