I assume you mean reflections on the bonnet (from a light bar). The bigger problem is dirt on the windscreen. When you're travelling you'll have a dirty windscreen very often. Youe eyes will focus on all these light spots. The bright hood will narrow your pupil and that reduces your scotopic view. of course you can see infront and around the car, so while driving slowly or easy roads (maybe illuminated roads), that isn't an issue. But as faster you get, the more of an issue it becomes.
However, driving through a city with high mounted high beamswitched on also leads to traffic signs dazzling you...however...that is really not an issue....
The next issue with high mounted high beam lights is, that ditches are illuminated from above so there is no or only less shadow. On a track, where eerything is the same color this makes it difficult to see the ditch. If the light is more flat, you will have a dark shadow where the ditch is which you can recognize. So if you're going do drive washboard tracks you don't want to oversee a ditch as you wil drive between 60 and 90 km/h (with 2.7 tons minimum).
Of course, if all that doesn't apply to you, you don't have to think about that and the reduced performance might not mean anything to you.
Again, check rallye cars and where they mount their lights. These guys and ladies need the best performance with no disturbance to drive safe and fast. If someone can adopt that easily, why not? However, everbody has the choice...
Cheers
AWo
