The Bible, 10th edition, says:
Further on this point, The Pacemaker Graphics Instruction And Reference Manual says to use GE or Westinghouse #31 or Sylvania #2A bulbs with 3x4 and 4x5 Pacemaker Speed Graphics' focal plane shutters at speeds of 1/250, 1/500 and 1/1000. 1/500 should be usedThe larger focal-plane shutters, up to 4x5 inches, require the use of the bigger Class FP lamps, the G-E No. 31 and Sylvania's 2A. These have a burning time of nearly 70 milliseconds and will cover the entire movement of the 4x5 focal-plane shutters at their higher speeds, in any case.And there you have it, OP, from the horse's mouth.only when uniform density cross the entire negative is not of primary importance.
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