A Bi-pin lamp base is a type of light bulb base that features two pins (or prongs) for electrical connections. These pins are typically spaced a specific distance apart and are often used for connecting to sockets in various lighting fixtures such as track lighting, under-cabinet lights, and some kinds of fluorescent lamps. Bi-pin bases come in several different sizes and configurations, most commonly designated by their pin spacing in millimeters. For instance, the G4, G5.
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