A-series light bulb
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The A-series light bulb is the "classic" type of light bulb that has been the most commonly used type for general-purpose lighting applications since the early 20th century. It has a pear-like shape and an Edison screw base. The number that follows the "A" within the A series indicates the width of the bulb in one-eighth inch units.
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, approximately 4 3⁄8 inches (110 mm) in length, and has a one-inch wide (type E26, i.e. approximately 26 millimetres wide) Edison screw base.
- "Discover Lighting – Electric Light Sources – Incandescent and Halogen". Illuminating Engineering Society.
The everyday incandescent lamp is called a general service lamp or an A lamp.
- "Lamp Size and Comparison Features" (PDF). WW Grainger Inc.
An A17 size bulb is 17-eighths of an inch or 2 1⁄8 inches (54 mm) in diameter at its maximum dimension.
- "Light Bulb Shapes and Sizes at a Glance". Bulbs.com.
- "LED University: Light Bulb Shapes and Sizes Explained". EagleLight.