Ford Mustang Forum - View Single Post - New Headlights More Efficient?
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post #15 of (permalink) Old 11-25-2019
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The difference in parasitic horsepower loss between incandescent bulbs and LEDS is likely going to be smaller than the % of error for any given dyno. In other words, negligible. The decision to change your headlights should be based on what you feel comfortable driving around with, light-wise, at night. IMHO, not blinding everyone while still being able to see the road is good.

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