The G5 cap is a 2-pin cap with, as its name suggests, a 5mm distance between its two pin centres. The pins of the G5 extend 7.1mm from the base.
This cap is used on extremely energy-efficient T4 and T5 fluorescent tubes, widely used in surface-mounted and recessed ceiling luminaires.
Miniature Bi-pin, Miniature Bi-pin Fluorescent.
T5 Miniature, T4 Fluorescent Tube, T5 Fluorescent Tube.