US Patent 10539273 Recessed replaceable LED office lamp

The present invention discloses a LED retrofit troffer, comprising a lamp housing and a lampshade, wherein, the bottom side of the lamp housing contains a bottom plate extending outwards, and the outer edge of the bottom plate is arranged on the mounting joist; the side edge of the bottom plate is arranged with a hanging plate, which is mounted on the lower side of the bottom plate via a plurality of connecting mechanisms and movably connected with the bottom plate, and a locking mechanism is arranged to lock the position of the hanging plate on the bottom plate. The present invention is convenient for mounting and disassembly, capable of being firmly fixed, and has attractive appearance, with wide acceptance.