By Shape »
Determine your current bulb by its shape.
Measurements »
How to properly measure your current bulb.
By Base »
Find your current bulb by its base.

How to Measure Your Bulbs

The diameter of a bulb is designated as a number following the letter which denotes the shape. A bulb's width is always measured in increments as eighths of an inch, for example, a standard A-19 bulb has a maximum diameter of 19 eighths of an inch, or 2.375 inches.
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