Hi all, and thanks for the responses!
You're right of course, that it isn't absolutely necessary to have each unit = 1 second, but it just seemed to make sense to me to start off with mine that way. I just got it, and am still finding my exposure times for polymer gravure plates. Sandy's original post made it sound like such an easy adjustment, that I thought I'd do it with mine too.
Another thing... my exposures (there have to be 2 exposures per plate), are going to be in the 30 to 40 second range. What I've found is that the bulb takes that long to come up to full brilliance. That wouldn't be a problem for long exposure times, because the integrator does it's job... but what happens with a shorter exposure time? That's one reason I'm interested in having my "units" well calibrated.