GU Type Bulbs
GU Type Pin Base Led Light Bulbs
A GU10 is the most common type of spotlight found in most homes nowadays. GU10 refers to the type of fitting. Two short, squar-ish pins protrude from the base of the bulb. The number of 10 refers to the distance in millimeters (mm.)between those two pins It’s a push-and-twist type of fitting.
A GU24 lamp fitting is a bi-pin connector for compact fluorescent lamps (CFL) or LED lamps that uses a bayonet mount–like twist-lock bi-pin connector instead of the Edison screw fitting used on many CFLs, LED lamps and incandescent light bulbs.