Different Light Bulb Base Sizes

A19 a15 a21 br bulged reflector spotlight and floodlight bulbs.

Different light bulb base sizes.

Decoding edison bulb base types. E26 bulbs are primarily used in north america while e27 bulbs are most. On our website we refer to our bulbs and string lights as c7 c9 and medium. This light bulb base is not very common and most often found on much smaller bulbs.

The following is a list of common basic types presented on a size lamps. The most familiar is the edison screw base found on most incandescent bulbs and many halogen compact fluorescent hid and now led bulbs. Common bulbs with e26 e27 bases. The industry uses many terms for the same size.

The size of a bulb base is determined by measuring the width of the base in millimeters at its widest point. E obviously is for edison. The size of the bulb base appears right next to the base style on the packaging in the form of a number. Bayonet medium by22d index double contact bayonet wedge bases.

The common terms are medium intermediate candelabra and mogul. For example a lamp with a medium base or e26 measures 26 millimeters 1 02 inches at its widest point on the base. There are many light bulb base sizes available. Shop by screw base with our universal bulb finder e26 e27 medium edison 26 mm or 27 mm diameter.

You can find this base on bulbs such as the t6 s11 and r12 but you will have to do a lot of searching to find these bulbs. Therefore a light bulb described as a gu 10 base will feature a 10 millimeter wide base. There are hundreds of unique bases for light bulbs. Types of light bulbs bases most a shaped lamps have a screw base e12 e17 or e26.