The LH1166 Kulka 582GDF replacement socket is a high-output, gasketed lampholder specifically engineered for Recessed Double Contact (RDC) T8, T10 and T12 fluorescent lamps in demanding environments like outdoor signage and commercial refrigeration. Rated for 660W and 600V, and for 800ma and 1500ma this "Grip-Tite" slide-on component features a durable white urea body and a spring-loaded plunger mechanism that maintains a secure electrical connection despite thermal expansion or vibration. Its defining "GDF" designation signifies the inclusion of a neoprene gasket, which provides a weather-resistant seal critical for protecting internal components from moisture. Typically paired with a compressible LH1167 Kulka 583GDF replacement counterpart, the LH1166 Kulka 582GDF replacement is a staple in industrial lighting due to its heat resistance and reliable performance in signs and refrigerated display cases.