Standard Light Bulb Base Size

It has a pear like shape and is typically fitted to either an edison screw or a bayonet cap base.

Standard light bulb base size.

This base was developed by thomas edison for the first light bulbs and is still in use today. A19 led filament bulbs in ceiling fan fixture a21 led bulbs in bedroom lamps a19 gold tint led filament bulb in porch light fixture a19 led fireworks bulbs in string lights. From top left to bottom right. Bulbs with these base types can be used interchangeably as there is only a 1 millimeter difference in base size.

E26 mes in north america e27 es in europe mogul. There are four commonly used thread size groups for lamps. The a series light bulb is the classic glass light bulb shape that has been the most commonly used type for general lighting service gls applications since the early 20th century. E26 is the size of most light bulbs used in the u s.

Standard arbitrary a bulbs are the most widely used and thought of when it comes to household lighting. E12 north america e11 in europe intermediate. Screw bases come in several sizes and they are referred to by both a descriptive name and size. It s used for nightlight bulbs and sometimes for decorative light bulbs used in chandeliers and over bathroom mirrors.

Unlike the light bulb shapes the number in the light bulb base measures the light bulb base diameter in millimeters. The candelabra e12 has a diameter of 12 millimeters. It s referred to as having a medium or standard base. They are commonly used for general lighting in standard light fixtures such as ceiling lights lamps can lights outdoor spotlight and flood light fixtures and.

A further explanation of the light bulb base sizes you can look at the letter number references e12 e17 and e26 to help understand a bulbs base style and size. E17 north america e14 small es ses in europe medium or standard. E12 is the smaller candelabra base. 1 888 455 2800 fax 1 508 363 2900.

The number that follows the a designation indicates the nominal major diameter of the bulb either in one eighth. The first letter designates the shape or form of the base and the number represents the width of the base normally in millimeters.