LED lights E27, MR16, PAR16 and GU10, etc. meaning

There are many types of lamp base commonly used lamp, such as E27, E14, GU10 and so on. The numbers after them indicate the interface size (mm). MR16, PAR16 and so on are the type of lamp cup, followed by the number of lamp cup size (unit: British cent, that is, 1/8 inch).

E27 and GU10 refer to different lamp holder types. E27, E26, E14, E12, etc. E at the beginning is usually: Screw socket. E27 refers to the screw mouth diameter 27mm screw head, E14 thread diameter 14mm screw head, as well as E26, E40 and so on.

GU: G means that the lamp type is plug-in type, U means that the lamp cap part is U-shaped, and the numbers in the back indicate the pin center distance in millimeters "mm". GU10 and GU5 have two circular pins, GU10 pin center distance of 10mm, commonly used in high-pressure lamps, and GU5 pin center distance of 5.33mm, commonly used in low-voltage lights.

MR: Multiface Reflect, Multi-reflector (lamp cup), the number behind the lamp cup diameter (in units of 1/8 inch), the diameter of the MR16 = 16 × 1/8 = 2 inches ≈ 50mm MR16 lamp commonly used lamp holder GU5. 3 (fine pin) and GU10. If E27, it is usually called PAR16.

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