Thanks, Bill. Here is my Irish "sensitometer", foot pedal operated. Balancing the higher output of the flash, for repeatability, with an ND cut from Lee lighting ND gels, I am sure to get some interesting spectral distribution, but it still beats my enlarger head (500H) for this purpose.

I measured some 400 pops over the film area, placing the meter in different positions, and it is repeatable within 0.1 f/stop at the surface. The central area might be 0.05f/stop higher than the outskirts. Ideally, the light source would have been further away, to eliminate this fall-off, but this will have to do for this test. I'll do some pre-tests, to check the exposure, and then I'll expose the test sheets. I'll report when I have them analyzed, and, hopefully, plotted out.