There are many types of LED bulbs, and different models are suitable for different lamps and scenes.
The following is a classification of common LED lamp types:
1. Screw-in lamp holder (E series)
It is screwed into the lamp holder through a thread, most commonly used in home lighting:
E14 (small screw):
14 mm in diameter, commonly known as "small screw" or "mini Edison screw".
Commonly used in small lamps such as chandeliers, table lamps, refrigerator lights, etc. (such as common in Europe and Asia).
E26 (standard screw):
26 mm in diameter, North American standard, equivalent to China's E27 (slightly larger thread, but usually compatible).
E27 (large screw):
The most common household screw in the world (Europe, China, etc.), used for ceiling lamps, chandeliers, etc.
E40:Industrial large screw
(40 mm in diameter), used for high-power street lights, factory lighting, etc.
2. Bayonet lamp holder (B series)
It is inserted into the lamp holder through the pin, which is common in traditional lamps:
B22 (bayonet):
Diameter 22 mm, rotate and fix after insertion (such as commonly used in Commonwealth countries).
B15 (small bayonet):
Diameter 15 mm, less common, used for specific small lamps.
3. Pin-type lamp holder (G series)
It is connected through two or more pins, mostly used for energy-saving lamps, downlights, etc.:
GU10:
Two pins with slots (rotate and lock after insertion), commonly used in spotlights and track lights (such as kitchens and exhibition halls).
MR16 (GU5.3):
The distance between the two pins is 5.3 mm, low-voltage 12V spotlight (need to be matched with a transformer).
G4/G5.3/G6.35:
Micro pins, used for low-voltage LEDs (such as cabinet lights and jewelry lights).
G9:
Two ring pins, used for small decorative lights (such as wall lamps and mirror lights).
G13:
Double pin spacing 13 mm, for T8/T10 straight tube LED (replacing traditional fluorescent tubes).
IV. Other special types
AR111:
Specially for high-end spotlights, with pins or screws (such as commercial lighting).
T-type lamp holder (such as T20):
For LED light strips or linear lamps.
R7s:
Long strip halogen/LED replacement lamps (such as outdoor floodlights).
PC plug:
Directly plug into the socket (such as LED night lights).
V. Selection precautions
Matching lamps: Confirm the original lamp holder model before replacement (usually marked on the lamp holder or old bulb).
Voltage/power: For example, MR16 needs to distinguish between 12V or 220V.
Regional standards: E26 (North America) and E27 (China/Europe) have similar threads but are not completely universal. you can consult more lamp base information on http://www.benweilight.com
