The SLK troffer retrofit kit is designed to be a quick, efficient and aesthetically pleasing upgrade for traditional prismatic and parabolic troffers.LED retrofit for existing 2x4 prismatic or parabolic troffers with a depth of 3 1-8" or greater in a modern style, Fully integrated hinged door assembly for simple installation and quick troffer conversion, Reduces waste on the job site by reusing existing fixture housing, High efficiency acrylic center lens with linear prisms for high performance and no pixelation, Color tuning technology SpectraSyncTM is available, Wired controls for NX Lighting Controls available.,