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G2.54 Bi-Pin Base light bulbs are bulbs that have a two pin (Bi-Pin) base. Bi-Pin Base bulbs are denoted by the letter G (as it applies to a base determination, NOT shape which denotes a globe lamp or bulb). The letter G is followed by a number which designates the gap width (from center to center) between the pins of the base in millimeters. A G2.54 Bi-Pin Base bulb has a gap width between its two pins (center to center) of 2.54 millimeters.