For example, the A19 bulb has 2 ⅜ inches in diameter. The number that follows a designation mark indicates the width of the bulb in one-eighth inch units or in millimeters.
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Try to find an appropriate light bulb when looking for a replacement product.Ī-series bulb type describes a common bulb that we all known as a pear-like bulb shape. Thus an E26 has a 26 mm base diameter, an E27 base has 27mm, and so on.Ī light bulb with an E26 base is standard for the North American market. The number following the E indicates the size in mm of the external thread screw. It is quite easy to understand the bulb base differences. Within the context of writing, we are talking about the diameter of the bulb:Īs you can see, the A19 bulb is smaller than A21, but there is more to write on this topic. Like we wrote already, the main difference between A19 vs A21 bulbs is their size. Note: What you can read from Wikipedia is that the number that follows the “A” designation indicates the nominal major diameter of the bulb, either in one-eighth inch units in the United States or in millimeters in the rest of the world. Before we go any further, read about the A-series light bulb on the Wikipedia page. This is why we are decided to give you some more details about each bulb type.
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We use both types in our home, and they are designed for residential usage. They both have the same purpose and behave similarly. The main difference between these bulbs is actually size in diameter.
Light bulb base sizes how to#
What does light bulb a19 vs a21 designation mean, how to recognize light bulb type, and which one to buy? Learn about bulbs and find out what is the difference between an A19 and A21 bulb.