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  1. The most common light bulb base sizes include:

    • Standard-Medium, a regular sized screw in base: E26 or E27
    • Candelabra, a smaller screw in base: E12
    • Intermediate: E17
    • Bi-pin, a pin-in base with two points of contact: G4 or GU24
    • Twist-And-Lock base: GU10
    www.gelighting.com/inform/guide-light-bulb-sizes-types-shapes-and-codes
    www.gelighting.com/inform/guide-light-bulb-sizes-types-shapes-and-codes
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