I think you'd do better to paint the hood black and put the light-bar in front of the top of the windshield but below the top. For visibility.
At the front, there is a stagnation point where the air is trapped, then bleeds off to sides, top or bottom. Anything you put there will have negligible effect.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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