Standard Light Bulb Base Sizes

Most common light bulb uses including lamps recessed flush mount flood lights are going to have one of the first three base types shown above.

Standard light bulb base sizes.

It s used for nightlight bulbs and sometimes for decorative light bulbs used in chandeliers and over bathroom mirrors. From top left to bottom right. 1 888 455 2800 fax 1 508 363 2900. Other sizes with a data sheet in iec 60064 are a50 a55 a67 a68 a71 a75 and a80.

Standard arbitrary a bulbs are the most widely used and thought of when it comes to household lighting. Shoppers of led light bulbs often confuse the specifications for base type e26 or e27 and bulb shape a19. E17 intermediate base is in between these two sizes. Medium standard base code.

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. 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. Common bulbs with e26 e27 bases. 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 vanity lights.

Unlike the light bulb shapes the number in the light bulb base measures the light bulb base diameter in millimeters. The first letter designates the shape or form of the base and the number represents the width of the base normally in millimeters. Pin type bases are normally used for track lighting landscape bulbs. Look at your fixture to determine its base type.

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. The candelabra e12 has a diameter of 12 millimeters. E12 is the smaller candelabra base.

60 mm wide at its widest point and approximately 4 3 8 inches 110 mm in length. E26 is the size of most light bulbs used in the u s. Screw in bulbs use a base called an edison screw or es base. Bulbs with these base types are available in many different styles.

Look at your fixture to determine its base type.