E39d Three-way Mogul (modified socket with additional ring contact for 3-way lamps)
* E40s European
* Skirted (PAR-38)

The light bulb commonly used since the early 20th century for general-purpose lighting applications, with a pear-like shape and an Edison screw base, is referred to as an "A-series light bulb." This most common general purpose bulb type would be classed as "A19/E26" or the metric version "A60/E27".

Bi-post

With bi-post bases, the lamp orientation

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