two headlight system optics?

g.daniels said:

using a bar mounted headlamp and a low fork mounted lamp-is there a
mix of color, say yellow on the bottom-white on top, producing more
definition on the killer pothole? than a standard two whites. or LED
blue whites as with Cateye, a color i assume is engineered for
definition or...?

Since yellow works best in haze, I would expect most situations would favor rider visibility of using the yellow on top for distance and the white below focussed on the road. If you had a tight ground hugging fog you might swap them out for that occaission.

Yellow on top would be less visible, but because it is the opposite common small motor vehicle orientations, I'd expect it to be more attention getting by a driver to notice due the unusualness of yellow over white.

(g.daniels) said:

LED blue whites as with Cateye, a color i assume is engineered for
definition or...?

The color is an artifact, like the blue color of florescents. Nobody
does it on pourpose.

the query is based on the very probable: that defense industry
innovators and grad physicists seeking their first mill have produced
at least 75 papers and proposals or an actual tank system
blamblamblam-remember, one dead arab equals a 1000 votes- for
generating increased visual awareness with the broached idea but they
were all in Nepal this weekend. I shall search boggle tomorrow...