Shop by Fitting(140)
Light Bulbs - Fitting
Which light bulb cap fitting is right for me?

Light bulb fittings are categorised by letters and numbers. The letter indicates the type of base, usually either screw or bayonet, and the number relates to the size. The right fitting is important to ensure it fits your lamp or light.

Bayonet Light Bulbs

The most common light bulb fitting is a bayonet cap bayonet light bulbs, known as B22. They are 22mm in diameter and require a simple twist and lock action to insert. Small Bayonet light bulbs are also available, known as B15.These have a smaller cap, 15mm in diameter.

Edison Screw Light Bulbs

Edison screw light bulbs have a screw base and are inserted by a simple twist motion. These are known as ES or E27 for the larger screw light bulbs. Small Edison screw light bulbs are less common than the larger screw cap equivalent. They are smaller in size and abbreviated to SES or E14.

Spotlight Bulbs

Spotlights have their own types of fitting, the most common being GU10. These are inserted with a twist and lock action. GU5.3 spotlight bulbs are the same type of bulb as GU10 but are smaller in size.

Specialist Bulbs

Sometimes the standard fittings aren't right for what you need. Some light bulbs have more specialist fittings, such as G9 or G4 which have 2 small pins and push into the fitting, or R7S which are mostly used on linear bulbs. If you are looking for appliance light bulbs you may require a specialist fitting.

Which fitting do I need? Close
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