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Old 03-26-2020, 01:19 AM   #11 (permalink)
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Does anyone have any data on this idea? I have been thinking about how to get better performance from my headlights and figure mounting them higher should make down range better. My first thought was to put them towards the top of the windshield using a sun visor style mount. I am not hoping to decrease drag as much as I am hoping to preserve what I have.

Is this a case of have your cake and eat it too?

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At 55 mph, a 10% drag reduction translates to a 5% increase in fuel economy. At 70mph,a 10% drag reduction translates into a 6% increase -Phil Knox (Aerohead), Aerodynamics Seminar #2
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My other hobbies have no ROI (making things go fast). So I'm having fun modding my car for better mileage and the side effect is that I save money on gas day to day.
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Old 03-26-2020, 01:43 AM   #12 (permalink)
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Having the lights above the sight-line is helpful when cresting ridges.

An example would be the 'laser light bar' on the Tesla Cybertruck.
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Old 03-26-2020, 07:49 AM   #13 (permalink)
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And causes oncoming drivers to want to beat you with a 2X4.
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Old 03-26-2020, 08:53 AM   #14 (permalink)
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And causes oncoming drivers to want to beat you with a 2X4.
My roofline is only a little bit taller than the stock headlight location of the headlights on my van. Cars around here are rare nowadays. It seems like 90% of headlights from oncoming traffic are about eye level with my car because of this.
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At 55 mph, a 10% drag reduction translates to a 5% increase in fuel economy. At 70mph,a 10% drag reduction translates into a 6% increase -Phil Knox (Aerohead), Aerodynamics Seminar #2
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My other hobbies have no ROI (making things go fast). So I'm having fun modding my car for better mileage and the side effect is that I save money on gas day to day.
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Old Today, 12:20 PM   #15 (permalink)
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headlight elevation

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My roofline is only a little bit taller than the stock headlight location of the headlights on my van. Cars around here are rare nowadays. It seems like 90% of headlights from oncoming traffic are about eye level with my car because of this.
Current headlight positioning might have to do with fog.Forty years ago,motorists were adding amber fog-lights under the bumper,to get the light source as low as possible,below some ground-level fog.Low-beam was recommended,so as not to blind the driver with their own lights reflected off the ground level clouds.This may be some obscure DOT requirement,rarely,if ever mentioned.Just a thought.
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Old Today, 01:24 PM   #16 (permalink)
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This was my favorite headlight setup. You could slouch down in the driver eat and use the headlight like a laser pointer. I think this was before I converted to quartz-halogens in the 1980s.

I would think that a light over the windshield on low beam would put less light in oncoming driver's eyes. Especially with Hella H-4s with their sharp cut-off.

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