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A Series

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What Is an A-Type LED Light Bulb ?

A-shaped bulbs are one of the most popular bulbs used in the home. They are so popular the A-shape is probably what comes to mind when someone says light bulb. To tell the difference between one A-shaped bulb and another, the bulbs are classified based on their diameter.


A-shaped bulbs are recognized by their traditional pear shape. Since they are used so widely, most A-type bulbs have a medium screw base. This base simply twists into the fixture where the bulb is used. Some A-type bulbs also have European medium screw bases, and twist and lock bases.

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With a diameter of 1.875 inches, A15 bulbs are the smallest of the A-shaped family.
Their most popular use is in signs and decorative lighting.


The A19 is the most commonly used A-shaped bulb. From lamps to ceiling fixtures, bathroom vanities to sconces, and so much more, there’s a use for A19 bulbs in every room of your house. The A19’s diameter is approximately 2.4 inches.

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© 2021 by Luxsent Lighting Corporation   |  Hsinchu County, Taiwan | +886 3 5500275

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