Advance H33 Mercury Vapor ballasts suitable/recommended for firing the 400w 6500K Iwasaki Metal Halide lamps. The part numbers are links to a local copy of the datasheet for that ballast in .pdf format.

71A40R1 MV 400w H33 50hz 454w@220/240V
71A4001 MV 400w H33 60hz 454w@120V
71A4041 MV 400w H33 60hz 454w@480V
71A4041T MV 400w H33 60hz 454w@480V
71A4071 MV 400w H33 60hz 454w@120/207/240/277V
71A4091 MV 400w H33 60hz 454w@120/207/240/277V
71A40D1 MV 400w H33 60hz 454w@120/240/347V
71A40J1 MV 400w H33 60hz 454w@220V
71A4300 MV 2*400w H33 60hz 880w@120V
71A4330 MV 2*400w H33 60hz 880w@277V
71A4340 MV 2*400w H33 60hz 880w@480V
71A4451 MV 400w H33 60hz 440w@120/240V
72C4083 MV 400w H33 60hz 450w@120/277V
73B4091 MV 400w H33 60hz 454w@120/207/240/277V
78E4041 MV 400w H33 60hz 454w@480V
78E4091 MV 400w H33 60hz 454w@120/207/240/277V
79W4041 MV 400w H33 60hz 454w@480V
79W4091 MV 400w H33 60hz 454w@120/207/240/277V