Can I use A19 instead of E26? check this out | a19 vs e26
Sophia Aguilar
Updated on July 15, 2026
So to answer your questions in short, A19 and E26 is not the same. two different parts of the same bulb, but they are almost always combined. “E26” on the other hand indicates what kind of base the bulb has. Most A19s will have an E26 base, but there are a few exceptions.
In contrast to A19 referring to bulb head size, E26 refers to bulb base size (the base is the part that you screw to your light socket). The E stands for Edison and the number refers to how many millimeters the base measures horizontally. In this case, an E26 bulb measures 26 millimeters sideways.
A19 refers to the shape and size of the bulb itself. “A” stands for Arbitrary — just the name of the shape that’s familiar to most of us. “19” refers to the size — in this case, 19/8″ (or 2 3/8″) across. E26 refers to the type and size of the base — the part that goes into the light socket.
Are A19 and E26 light bulbs the same?
All A19 lamps have an E26 base, but not the other way around
The standards that govern the dimensions and design of A19 light bulbs also dictate that it must use an E26 screw base. In other words, all A19 light bulbs also have an E26 base.
Is E26 a standard bulb?
The most common type of light bulb here in the United States has what is referred to as a “Medium” base or “Standard” base. A Medium or Standard base light bulb is also referred to as an E26 base light bulb.
What does A19 mean on a light bulb?
Bulb Shape
The number that follows the “A” within the A series indicates the width of the bulb in one-eighth inch units or in millimeters. The most commonly used A-series light bulb type is the A19 bulb which is 2 3⁄8 inches (60 mm) wide at its widest point and approximately 4 3⁄8 inches (110 mm) in length.
What are E26?
E26 is the size of most light bulbs used in the U.S. It’s referred to as having a “medium” or “standard” base. It’s used for nightlight bulbs, and sometimes for decorative light bulbs used in chandeliers and over bathroom mirrors. E17, “intermediate” base, is in between these two sizes.
What is A19 E26 bulb?
A19 refers to the shape and size of the bulb itself. “A” stands for Arbitrary — just the name of the shape that’s familiar to most of us. “19” refers to the size — in this case, 19/8″ (or 2 3/8″) across. E26 refers to the type and size of the base — the part that goes into the light socket.
Is E26 the same as E27?
E26 stands for 26 mm and the E27 for 27 mm in diameter. These two standards are interchangeable, meaning a US E26 will fit in a European E27 base, and E27 will fit in a E26 base. The only difference is the voltage (for light bulbs).
Are E26 and G25 the same?
The G25 shape is usually pared with a E26 (medium) base, similar to that of a standard A19 and come in outputs ranging from 25 watts to 60 watts. G25 LED Bulb Replacements G25 shaped LED bulbs now exist and are a great replacement for decorative and vanity applications.
Is E26 the same as A21?
A21 bulbs always use E26, but not vice versa
According to ANSI standards, A21 bulbs must always use an E26 base for mounting into a light fixture. A21 and E26 refer to different things, but in this case, you will find that all A21 bulbs use E26 lamp bases.
Are E12 and E26 the same?
E12 is a designation used for a type of lamp base used on a light bulb. You are likely familiar with E26 lamp bases – the standard screw-in lamp base, approximately 1-inch in diameter, commonly used in standard A19 lamps. E12 uses the same naming system as E26, whereby the letter “E” signifies an Edison screw base.
Is A15 the same as E26?
There’s a “bulb size” and a “base size.” The bulb size is self explanatory. The A15’s are smaller bulbs, while the A19’s are larger. They both fit in a standard household medium base (E26 base.) A15 bulbs are usually recommended in a close quarters area, maybe on a small lamp or something.
What size bulb fits an E26 socket?
E26/E27 Medium – Edison 26-mm or 27-mm Diameter
Bulbs with these base types can be used interchangeably as there is only a 1-millimeter difference in base size.