yes, by "splotches" I meant the dark shadow areas between the lights, as against the continuous lighting on the left side of the image.
I was hoping the difference between the two sides would be self-evident.
Regarding the other questions: but of course, yes, everything is the same!
In any case, I figured it out, and it must be related to the way Enscape interprets the light emitter in the Revit family.
It was the rotation of the light emitter. See screen shot.
Rotating the light emitter (not just 45 degrees) caused Enscape to use a single point emitter, or a very reduced one (length wise).
Leaving the emitter at 0 degree, produces the expected result of consistent lighting across the length of the light emitter element.
I am not sure in which court this bug is, Autodesk or Enscape.
I hope this is going to help someone else with the same issue...