Standard Light Bulb Base Size

Bulbs with these bases are the most popular of all screw base bulbs.

Standard light bulb base size.

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. 1 888 455 2800 fax 1 508 363 2900. Bulbs with these base types can be used interchangeably as there is only a 1 millimeter difference in base 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.

This base was developed by thomas edison for the first light bulbs and is still in use today. From top left to bottom right. The first letter designates the shape or form of the base and the number represents the width of the base normally in millimeters. Standard arbitrary a bulbs are the most widely used and thought of when it comes to household lighting.

E17 intermediate base is in between these two sizes. There are four commonly used thread size groups for lamps. E17 north america e14 small es ses in europe medium or standard. E12 north america e11 in europe intermediate.

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. 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. E26 mes in north america e27 es in europe mogul.

It s used for nightlight bulbs and sometimes for decorative light bulbs used in chandeliers and over bathroom mirrors. E26 is the size of most light bulbs used in the u s. E12 is the smaller candelabra base. The number that follows the a designation indicates the nominal major diameter of the bulb either in one eighth.

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. Screw bases come in several sizes and they are referred to by both a descriptive name and size.