K12s Base: The "K12s" designation likely refers to a specific type of base used for certain lamps, including metal halide lamps. It's important to note that different lamp manufacturers may use various base codes, so the exact specifications and designations can vary. A K12s base would typically be a type of bi-pin base with pins positioned at a specific distance from each other. The "s" often denotes a "short" version of the base, which...