When you are out to buy a new bulb and you have no idea which fitting it is you need, you might as well go home. This is why you need to understand the differences between fittings and the choices available to you especially when it comes to bi-pin bases. What is Bi-Pin Fitting? Bi-pin or Bipin is sometimes referred to as bi-pin cap, bi-pin socket, or two-pin. This is a type of lamp fitting, which is included in the IEC standard. These fittings are often used on small incandescent light bulbs, particularly halogen lamps. Sockets can have pins placed closer together to help prevent the insertion of bulbs that consume a lot of electricity as this can generate excessive heat, which may possibly cause a fire. Bi-pins were invented by Reginald Fessenden for the 1893 World’s Fair
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