If you are looking for a Type B tube-ready LED T8 fixture, Keystone has you covered. They have strip fixtures in 4' 1-lamp, 4' 2-lamp and 8' 4-lamp configuration (the 8' fixture allowing for four 4' LED T8 lamps). They also have 8' LED T8 ready fixtures that accept 8' lamps in either R17d high output or FA8 single-pin style. Optional wire guards. If you need a different style, they have highbay fixtures in 4' 4-lamp or 4' 6-lamp. For a recessed application, they also have Prismatic Troffers for LED Tubes that come in 2x2 2-lamp, 2x4 2-lamp, 2x4 3-lamp and 2x4 4-lamp configurations. All have pre-wired sockets and designed for single-end wired bypass LED lamps (although the strip fixtures that allow for 8' lamps are designed for double-end wiring per those lamp styles).