The HST LED provides an energy efficient alternative to fluorescent surgical troffers. Surgical troffers are designed to supplement the primary procedure lighting in the surgical theater. When grouped to surround the perimeter of the operating table, The symmetric/asymmetric lens distributes light both downward and toward the surgical field, diminishing shadows and reducing eyestrain of the surgical team. A gasketed steel door with clean concealed hinge seals plenum contaminates from the surgical suite. For row-mounted flange applications, linking connectors are offered or end flanges maybe conveniently removed to allow fixtures to be fastened to one another.