I do a pretty hefty commute of 60 miles each way and it is pretty much all highway, but I go through about 2 construction zones. I believe the culprit are those freaking gravel hauling trucks or a construction vehicle that went off-roading in a boulder field.
I thought about ducting of some sort. I do have the mountue air-box, but the lower tube is only long enough for the driver side. I would need a velocity stack of some sort, but it would work. Brake ducts are a little more work than I am willing to go through for someone who doesn't experience brake fade.
I like the cover idea. It would be nice if there were some sort of removable shield that one could remove when needed, but safely tuck away the light when not in use.