Lighting Fittings

The cap or base is the generally used term for the part of the lamp that connects the bulb to the light fitting. This provides the secure connection of the electrical contact between the lamp and the bulb itself. There are various different methods in which fittings are designed, many require different ways of fitting and require correct installation. 

Bayonet Cap

The bayonet is the most popular structure of fittings and in commonly used in most regular light bulbs and lamps. It is approximately 22mm in diameter and has two locating lugs. In order to fit a Bayonet fitting into a lamp a push and twist motion will have to be adopted.

There is a smaller version of the bayonet cap used for smaller fittings, they are very much alike but have only a 15mm diameter. While Bayonet caps are usually used for mains voltage lamps, the SBC Fitting can also be found in just a few low energy halogen lamps.

Edison Screw Cap

Deriving its name of course from the influential inventor Thomas Edison, the Edison Screw Cap fitting is used worldwide in a huge number of applications.

The most popular of Edison screws are that of the E27 range, with a fitting of 27mm in diameters and is commonly used in both the US and Europe. The Edison screw is used often in decorative fittings, chandeliers and appliance bulbs mainly around the UK.

Halogen Capsules

Small halogen capsule lamps are generally chosen by the measure in millimetres between the pins. Linear Halogen capsules for floodlights and up lighters have a 7mm R7s cap at each of a long quartz capsule.

Fluorescent Tubes

Fluorescent strips generally have a two-pin fitting at both ends of the tube.

Incandescent Strip Lights

Architectural strip lamps are available with two different fittings. One type has two S14s connectors one near either end of the lamp.