This standard serves as a consolidation and revision of three standards dealing with the 150-Watt M81 Double-Ended Metal-Halide Lamps (C78.1385), the 100-Watt, M91 Double-Ended Metal-Halide Lamps (C78.1386), and the 250-Watt, M80 Double-Ended Metal-Halide Lamps (C78.1387).