Standard Light Bulb Base Sizes

Unlike the light bulb shapes the number in the light bulb base measures the light bulb base diameter in millimeters.

Standard light bulb base sizes.

It s used for nightlight bulbs and sometimes for decorative light bulbs used in chandeliers and over bathroom mirrors. 1 888 455 2800 fax 1 508 363 2900. E26 is the size of most light bulbs used in the u s. Look at your fixture to determine its base type.

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. There are many light bulb base sizes but there are three basic sizes for the most common type of screw in light bulb also known as the edison bulb for the man who invented them thomas edison. The e just stands for edison while the numbers refer to the width of the. E12 is the smaller candelabra base.

The first letter designates the shape or form of the base and the number represents the width of the base normally in millimeters. Shoppers of led light bulbs often confuse the specifications for base type e26 or e27 and bulb shape a19. 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. Look at your fixture to determine its base type.

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. Common bulbs with e26 e27 bases. Medium standard base code. E17 intermediate base is in between these two sizes.

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. Pin type bases are normally used for track lighting landscape bulbs. Screw bases come in several sizes and they are referred to by both a descriptive name and size. This base was developed by thomas edison for the first light bulbs and is still in use today.

These popular basic screw in light bulb base sizes are e12 e17 and e26. Bulbs with these base types are available in many different styles.