Light Fitting Caps

Light fitting caps, also known as lamp bases or sockets, are standardised connectors used to attach light bulbs or lamps to lighting fixtures. Understanding the different types of light fitting caps is essential for selecting the right bulbs and ensuring compatibility with your fixtures. In this guide, we’ll explore some of the most common light fitting caps, including their descriptions, dimensions, and voltage ratings.

E26/E27 (Edison Screw)

The E26 (US) and E27 (Europe) caps are among the most widely used light fitting caps globally. They feature a screw base design and are compatible with a variety of bulb types, including incandescent, LED, and CFL.

• Dimensions: 26mm diameter, 26 threads per inch.
• Voltage: Typically rated for 120-240V

The E26/E27 caps are versatile and can be found in a wide range of applications, from residential to commercial settings. Their screw base design makes them easy to install and replace, making them a popular choice among consumers.

E14 (Small Edison Screw)

The E14 cap is a smaller version of the E26/E27 cap, featuring a screw base design suitable for smaller light fixtures and decorative lamps.

• Dimensions: 14mm diameter, 14 threads per inch.
• Voltage: Typically rated for 220-240V

The E14 cap is commonly used in decorative lighting applications, such as chandeliers, wall sconces, and table lamps. Its smaller size makes it ideal for fixtures where space is limited, while still providing a secure and reliable connection.

GU10

The GU10 cap features a twist-and-lock design commonly used for spotlight and track lighting fixtures. It is often found in residential and commercial settings.

• Dimensions: 10mm diameter, 10mm between pins.
• Voltage: Typically rated for 220-240V

The GU10 cap is popular for directional lighting applications, such as recessed lighting, track lighting, and spotlights. Its twist-and-lock design ensures a secure connection, making it a reliable choice for high-intensity lighting solutions.

GU5.3/MR16

The GU5.3/MR16 cap is another twist-and-lock design commonly used for low-voltage spotlight and track lighting fixtures, often featuring halogen or LED bulbs.

• Dimensions: 5.3mm diameter, 5.3mm between pins.
• Voltage: Typically rated for 12V

The GU5.3/MR16 cap is ideal for low-voltage lighting applications, such as landscape lighting, display cases, and accent lighting. Its compact size and twist-and-lock design make it easy to install and replace, while still providing reliable performance.

G9

The G9 cap features a two-pin design commonly used for compact, capsule-shaped halogen bulbs found in decorative and under-cabinet lighting fixtures.

• Dimensions: 9mm between pins.
• Voltage: Typically rated for 220-240V

The G9 cap is popular for its compact size and versatility, making it suitable for a variety of decorative and task lighting applications. Its two-pin design ensures a secure connection, while its compact form factor allows for creative and flexible lighting designs.

B22 (Bayonet Cap)

The B22 cap features a bayonet twist-and-lock design commonly used in the UK, Australia, and other countries. It is compatible with a variety of bulb types, including incandescent, LED, and CFL.

• Dimensions: 22mm diameter.
• Voltage: Typically rated for 220-240V

The B22 cap is a popular choice in regions where bayonet caps are prevalent, offering a secure and reliable connection for a wide range of lighting applications. Its twist-and-lock design makes it easy to install and replace, while its compatibility with various bulb types adds to its versatility.