No matter how the end user places the light bulb base into the socket it will always turn and lock into the same position every time creating a fail safe for the light bulb s operation.
Standard usa light bulb base.
Screw in bulbs use a base called an edison screw or es base.
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Common bulbs with e26 e27 bases.
E17 intermediate base is in between these two sizes.
Bulbs with these base types are available in many different styles.
E26 is the size of most light bulbs used in the u s.
Light bulb base chart.
They are commonly used for general lighting in standard light fixtures such as ceiling lights lamps can lights outdoor spotlight and flood light fixtures and vanity lights.
Screw bases 10mm miniature screw e10.
The e27 is the european variant and is rated at 220 volts.
E12 is the smaller candelabra base.
However an e26 bulb can fit in e27 base and an e27 bulb can fit in e26 base without problem.
The e26 is the standard 120 volt american base.
The light bulb base and socket are manufactured in a way that predetermines the light bulb s position in the socket.
Globe standard traditional.
It s used for nightlight bulbs and sometimes for decorative light bulbs used in chandeliers and over bathroom mirrors.