I have a 2009 Fit Sport, and I've noticed that my headlights are getting dimmer and dimmer. I asked my mechanic if he could install brighter bulbs, but he said a brighter bulb would melt the plastic housing. He said he could do a procedure on the lens that should make the lights brighter, but the only alternative is to replace the headlight housing.
Lenses clouding due to age, abrasion & sunlight do gradually and unsafely reduce illumination. Many ways to polish including kits in auto-parts stores or even toothpaste, but sealing with clearcoat or lacquer is critical to ensure longevity of the fix.
Harbor Freight sells a headlight buffing kit to treat the UV surface dulling/yellowing that worked surprisingly well on our 2007 Fit's headlights for the very low price it cost us.
Also, even halogen lights get less bright over time, but there are LED headlight replacement bulbs- we bought ours from an Amazon vendor, and they're brighter than some OEM high beams I've used.
Be careful on the way they're oriented though, because if they're installed upside down, they'll less effective.
It happened to us after I hit a deer and the collision shop put one back in upside down.
Keep in mind that LEDs are polarity sensitive so if they're installed with reverse polarity, they won't work (unless they have a module that will allow you to connect it either way and it will direct the proper polarity to the LED elements).
maybe the headlight casing became hazed or occluded, this can be fixed by using a lens polish kit that has a mild abrasive to remove the outer layer of discoloration. this could brighten your headlights.
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