Model of LED Bulb

LED bulb adapter is generally classified as E10/ E11/ E12/ E14/ E17/ E26/ E27/ B22/ MR16/ GU5.3/ GU10, following are some details:

MR16：Refers to lighting fixtures with multifaceted reflector and outer diameter of 2 inches maximum. The model consists of English letter and digital numbers. MR is abbreviation of Multifaceted（Mirror）Reflector, means a reflector combined by multi reflecting faces. The digital numbers mean the maximum outer diameter, is times of 1/8 inch, so 16 refers to a reflector whose outer diameter is 2inch in maximum Normally our daily light cup and spotlight use this kind of light adapter, most low voltage (12V、24V、36V and etc) lighting fixtures also use MR16.

GU10：G refers to plug-in light adapter, U refers to the U shape of light adapter, the number means the pin spacing from center to center is 10mm, GU10 is the most common one, also GX6.35，GY9.5，GY6.5，GX16D and etc are available.

E14：E refers to thread, the digital means the connector diameter is 14mm, the E14 light adapter is used to screw in E14 light connector. E14 is widely used in ceiling light and crystal light.

B22：B refers to socket, the digital means the connector diameter is 22mm, the B22 light adapter with two raised latches is used to socket in EB2 light connector. B22 is a most common connector of light bulbs.

E27：E refers to thread, the digital means the connector diameter is 27mm, the E27 and B27 are widely used in daily life, also E40 is used for special lighting fixtures of high power, such as metal halide light of 1000W and etc.

There are some other special adapters, such as horizontal plug-in G24 which is normally used in spotlight downlight (whose emitting angle is 180°) of ceiling of supermarket and hotel.sourcechipglen