A-Type Style Lamps which include A15, A19, A21, A23, and A25 shapes.

The A-Type light bulb is the “classic” light bulb shape that has been the most commonly used type for general lighting service applications since the early 20th century. It has a pear-like shape and is typically fitted to either an Edison screw (E26 Medium Base) or GU24 (Twist Lock Bi-Pin Mount).

The number following the “A” refers to the diameter in 1/8 inch increments.

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