40w E12 Type B Light Bulb – The caps that sit on the foundation of a light bulb are just as crucial as the bulb. True, those little metal fixtures might appear fairly insignificant given their size but their importance is that they dictate that bulbs can be fitted to that lighting fixtures. Without the right cap, the space, alleyway, stairwell or bathtub will stay in the dark.
With the range of lights that can be found on the market today, there are very definite specifications to ensure the right bulb is fitted. By way of instance, the two pin, or bi-pin, the cap on some lights can only be put in bi-pin light sockets, so gu10 LED bulbs can’t be set in a light socket which is not meant for the gu10 cap. However, there is more than 1 kind of bi-pin cap, together with the cap on g9 halogen bulbs considerably different in design and appearance, and used only with particular kinds of halogen bulbs.
The reason behind a cap is to allow electrical contact between the electrical supply and the lighting itself, without even leaving wiring and electronic aspects exposed. The metal pins make immediate contact with the electricity source, allowing the electricity to flow through the filament, producing the essential power to create the light to glow and supply the required illumination.
The entire range of caps is extensive, but they can be divided up into three main kinds, namely the bayonet, the Edison screw and the bi-pin. |} Bayonet Cap This is potentially the most identifiable cap and can be more often than not discovered on the normal incandescent bulbs choice for national lights, though energy saving lights also feature this cap to allow simple change over to greener home lighting.
The layout is a simple metallic cap at the bottom of the bulb with 2 ears, or small pins, protruding from the side. The title bayonet is derived in the thrust and twist action that is needed to fit them.