How can I choose the right bulb base?

How can I choose the right Bulb base?

led bulb, led light

The "base" is the part of the lamp that connects into the fixture and provides the electrical contact.
Different variants exist as regards the caps of ampoules. With the following guide, we will explain the differences between each so that you can choose the appropriate base for your installation. Certain specific features will undoubtedly help you to find a suitable LED alternative. There are two common types of plugs, Edison (E) and Bayonet (B), and Pin (G).

When replacing, always respect the base of your old bulb so that it can work!

All replacements are possible without any modification (mechanical or electrical) being necessary. If you are using a dimmer, which is quite common for decorative light fixtures, be sure to opt for a compatible LED solution.

Edison Screw Cap / Bayonet Cap

The most common screw caps are E14 and E27, the number associated with the letter "E" for Edison is that of the diameter of the screw in millimeters. The bayonet cap is older than the screw bulb system. Thus, a bulb with a base B15 or B22 is a so-called bayonet bulb, the number referring to the diameter of the base expressed in millimeters.

Pin with pins

The bulbs with pin base are identifiable thanks to the letter "G", which refers to "glass" because it was the original material used for the manufacture of contact pins, followed by the distance expressed in millimeters between two pins.

The GU cap ("U" for "Universal"), also called "bayonet", with two pins at the bottom of the bulb that clicks in a quarter turn in the grooves of the socket. The number also refers to the distance expressed in millimeters between the two pins.


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