Standard Light Bulb Base Size

The first letter designates the shape or form of the base and the number represents the width of the base normally in millimeters.

Standard light bulb base size.

1 888 455 2800 fax 1 508 363 2900. Bulbs with these bases are the most popular of all screw base bulbs. Standard arbitrary a bulbs are the most widely used and thought of when it comes to household lighting. E12 is the smaller candelabra base.

It s referred to as having a medium or standard base. Screw bases come in several sizes and they are referred to by both a descriptive name and size. 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. E17 north america e14 small es ses in europe medium or standard.

Fluorescent pin bases miniature bipin medium bipin single pin recessed double contact 4 pin single ended 4 pin 2gx 13 axial twist lock bases 10mm gu10 10mm gx10 24mm gu24 bi pin bases 4mm g4 4mm gu4 4mm gz4 5 3mm g5 3 5mm g5 5 3mm gu5 3 5 3mm gx5 3 5 3mm gy5 3 6 35mm g6 35 6 35mm gy6 35 6 35mm gz6 35 8mm gy8 8 5mm g8 5 9mm g9 9mm g9 pin. E26 mes in north america e27 es in europe mogul. 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. From top left to bottom right.

Unlike the light bulb shapes the number in the light bulb base measures the light bulb base diameter in millimeters. E17 intermediate base is in between these two sizes. 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. The candelabra e12 has a diameter of 12 millimeters.

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. The number that follows the a designation indicates the nominal major diameter of the bulb either in one eighth. Bulbs with these base types can be used interchangeably as there is only a 1 millimeter difference in base size.

E26 is the size of most light bulbs used in the u s. It has a pear like shape and is typically fitted to either an edison screw or a bayonet cap base.