LBrown, I think you have given a lot of thought to the light bar issue, but I wonder if you may have overthought some of the issues?
You wrote: <font color="red"> (A) Allows adjustment of the distance the lights shine out from the tractor.
(B) Gives more clearance above the lights and more head room under them.
(C) Lessens the chance of catching the lights on something overhead.
(D) Allows the lights to flip down if hit rather than breaking them.
(E) You can just flip the lights down to work under low hanging branches instead of having to remove them from the rops. However you still have the option of removing the bar and lights and unplugging the trailer connector.
*Advantages of the 360 degree rotation *
(A) Permits two lights instead of requiring 4 lights, thus reducing current flow.
(B) Lights can be turned both to front or both to rear. Or they can be turned one to front and one to rear. They can also be used for side lighting. Swiveling lights can provide illumination 360 degrees around the tractor. </font>
I would tend to think that using 4 lights has some advantages that you might not be considering, and I would think that if switched properly, 4 lights will not draw any more current than 2.
Consider your point (A) above, if the 2 front lights are switched on 1 circuit and the 2 rear lights are switched on a 2nd circuit, then you are only drawing enough current to power 2 lights at a time. Or if you want more light, you can power all 4 by flipping both switches.
Consider your point (B) above, where you write about swiveling the lights to illuminate other areas, or for 1 forward and 1 reward. In my case I've used my tractor as a giant size flashlight to illuminate a work area while doing planting in the evenings. I actually have 2 mounted forward, 2 mounted rearward, and 1 rear facing light at the base of my ROPS and there are times when I wish I had more lights.
I'm really not trying to pick apart your thoughts, just trying to point out that there can be some advantages to the concept of more is netter, and may that still may not be enough!