Patriot36,
I think part of what is happening is the light reflective nature of the road is having some degree of a neutralizing effect on the beams and therefore how the camera interprets them. I would be willing to bet that if we were there the beams would have looked as you described to our eyes too.
If the dirt was very dark brown or grass instead, the auto white balance would likely have shown the M6 slightly yellower and the N30 slightly greener.
These days with most decent cameras,
I really do not like using anything other then auto white balance because the pictures show more realistic colors even if they are a little more saturated. I have demonstrated this at different get togethers. This is particularly true when the distances for the targets start getting to the end of the effective range for different lights and their color temp becomes more noticeable.
I got tired of seeing photos with cameras set to "daylight" only to see the pictures show colors that are all off and not being any better at showing total light output.
Take Care,
mtbkndad :wave: