How to choose the small lamp holder?

A small lamp holder, also known as the Edison screw fitting, is a threaded screw lamp holder used to hold and connect a light bulb to a power source. Invented by Thomas Edison and marketed in 1909, these small lamp holder typically have right-hand threads, which allow the light bulb to be screwed in clockwise and removed counterclockwise. To deter theft in public places, the threads are sometimes reversed to prevent installation in common light fixtures.

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