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Common Cap Fittings Explained

Common Cap Fittings Explained

Common Cap Fittings Explained
One of the first considerations when purchasing a light bulb is making sure that it will fit the light fitting correctly. To help you find the light bulb you need, they're grouped by cap fitting.
 
A cap fitting feeds an electrical connection to your light fitting and ensures that it's held in the correct position. Our guide below will help you understand the difference between each cap shape and sizes.
 
 

Bayonet Caps

 
 
The UK's most common cap fitting with a push, twist and lock action. Commonly written as BC.
 
 
Smaller version of B22 with a push, twist and lock action. Also known as SBC.
 

Edison Screw 

 
Another regularly used cap fitting with a screw in action. Commonly written as ES.
 
Smaller version of E27 with a screw in action. Also known as SES.
 

GU10

 
Not dissimilar from a bayonet cap, these types of bulb have a push, twist and lock action. Used in spot lighting.
 
 
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