The H.H. Fluorescent 1-420 is a versatile, unshunted lampholder designed for linear fluorescent or LED tubular lamps. It is primarily used with T8, T10, and T12 lamps featuring a G13 medium bi-pin base. The H.H. Fluorescnet 1-420 is often categorized as a "stationary" or "fixed" style socket, typically used in pairs with a compressible socket (LH0351) to hold the lamp in place via spring tension. It is similar or equal to the Leviton: 13571 and DM Technology: DM38-31 or 85531