Audi A3 Tail Light Bulb Size – The caps that sit on the foundation of a light bulb are equally as important as the bulb themselves. True, those tiny metal fittings might appear fairly insignificant given their size but their significance is such that they dictate which bulbs may be fitted to which light fittings. Without the ideal cap, the space, alleyway, stairwell or bathtub will remain in the dark.
With the range of lights available on the market today, there are very definite specifications to make sure the ideal bulb is fitted. By way of example, the two pin, or bi-pin, the cap on certain lights can only be put into bi-pin light sockets, therefore gu10 LED bulbs can’t be set in a light socket which is not designed for your gu10 cap. But, there’s more than one type of bi-pin cap, with the cap on g9 halogen bulbs significantly different in design and appearance, and utilized only with certain types of halogen bulbs.
The main reason behind a cap is to allow electrical contact between the electrical supply and the light itself, without leaving wiring and digital aspects exposed. The metal pins make direct contact with the power supply, allowing the power to flow through the filament, producing the necessary power to create the light to glow and provide the required illumination.
The full range of caps is extensive, but they are sometimes broken down into three main types, namely the bayonet, the Edison screw and the bi-pin. |} Bayonet Cap This is potentially the most identifiable cap and is more often than not found on the ordinary incandescent bulbs selection for national lighting, though energy saving lighting also contain this cap to allow easy change over to counter house lighting.
The design is a simple metallic cap at the bottom of the bulb with 2 ears, or small pins, protruding from the side. These two pins lock in the face of the socket, to hold the bulb in place. The title bayonet comes from the thrust and twist action that’s necessary to fit them.