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G4 Lamp Holders 2A led halogen lamp holder base: G4 Lamp Holders: G indicates the type of lamp holders are a plug-in, followed by numbers indicate light foot hole center distance of 4mm. MR16 lamp holders is a multi-reflecting surface, for halogen replacement LED spotlights, we also used to call it is MR16, E27, E14, GU10 lamp holder with respect to said, as the two-pinthe distance between the 5.3 sockets, so some pe