Professional Custom Lamp Holder Accessories Manufacturer

Porcelain 2 pin halogen bulb socket "MR"  abbreviation Multifaceted Reflector means a multi-faceted reflector.16 inch unit 16 English = 2 inches = 50.8 (mm) MR11 PAR20 PAR30 lamp cup diameter common caliber, etc.
G5.3 lamp pin pitch of 5.3mm, common G4 G8 G9
Previously MR16 are more for 2 pin halogen bulb socket, now LED High Power MR16 ceramic base.

The lamp holder commonly used E27 B22 E14 MR16 GU53 JDR GU10 E40 and so on.
MR16, E27, GU10 refers to the different specifications of the lamp holder, called spotlights also called lamp cup.
E27 refers to the diameter of the threaded port 27mm screw base, E14 is the thread diameter of 14mm threaded lamp holder. MR16-diameter = 16 × 1/8 = 2 inches ≈ 50mm in shape, the MR series is a fine pin, MR16 2 pin halogen bulb socket low voltage lights.
GU: G indicates the type of lamp is a plug-in, U lamp part of a U-shape behind the numbers that light foot hole center distance (in mm "mm"). GU10 two round pins, GU10 ceramic lamp holder.