Abstract: Lamp having a rectangular bulb housing and a cage-like outer guard assembly therefor. The bulb housing is generally in the shape of a modified cube elongated in one direction. The housing has four substantially same size rectangular sidewalls extending between substantially square head and tail endwalls. One of the sidewalls is imperforate and serves as a mounting base. The other three sidewalls have windows of heavy, heat-resistant, transparent glass-like or ceramic material. The head endwall has a pair of glands including flanged, threaded bushings to seal electrical power conductors extending through it. The flanges of the bushing have wrench-engageable flats. The endwalls have a pair of axially aligned, screw-threaded openings of identical thread diameter and pitch. Screw-threaded head and tail cover members are threadedly engageable within these openings.

Abstract: Lamp having a lighting assembly, an inner guard assembly, and an outer guard assembly. The lighting assembly includes an elongated fluorescent bulb, starter and ballast members each having a socket portion removably connected to pins at the ends of the bulb, and an electrically conductive grounding bar interconnecting the starter and ballast members. The inner guard assembly includes a transparent cylindrical plastic housing enclosing the bulb, and end housings at the ends of the cylindrical housing enclosing the starter and ballast members respectively. The outer guard assembly includes an elongated support plate to which the end housings are fastened, a plurality of hoops fastened to the support plate at spaced intervals, and a plurality of guard rods parallel to the bulb housing welded across the hoops to provide a cage-like outer protection for the inner guard assembly.