Two of them are almost aimed at the same area. Two 1000 watt fixtures I think would almost cover the same area, 3 would for sure. 3000 watts? So what! The more the better. How about 3 new 1000 watt Widelites or Hubbell Magnuliters.
Not that metal Halide lamps last that long anyway....but if 100 and 175 Watt Mercury Vapor Lamps Last Longest...which Metal Halide wattages Last Longest.