Same thing happened to my old A5. Your ballast is likely dying, you’ll likely need to replace that and the bulb. You don’t need a whole new headlight.
I bought a cheap 2005 mercedes with a burned out headlight. I took the front bumper shell off (kind of a pain), then swapped parts to determine a ballast was bad. I cross referenced part numbers and bought a VW ballast on ebay for $55. Put it all back together and all is good.
Our kits will ignite in cold weather and extreme hot weather and why they have become so popular, we had a few emails where morimoto failed to ignite in cold weather, some switched to our ballast the issue was gone.
I used the 35w morimoto 3five ballast(discontinued, i think there's a replacement) without a relay. Works just fine.
Headlights are all perfect now. Both ballasts should site right side up, meaning red part is perfectly downwards and the font on the rear should be right side up (readable if your head wasn't up-side-down in your hood). So anyone else who has this 'V' shape issue probably has the same problem: incorrectly installed ballast (upside down, not in far enough, loose, etc.)
It's pretty easy, you can keep your stock housing and just replace the bulbs and mount the ballast (Hella).
That's the only slightly ghetto part of the setup -- the ballasts that came with the lights were neither the ones that fit in wheel well nor the ones that fit on the headlights themselves -- they're just kinda big blocks with cables on them. So I just kinda stuffed them in the engine compartment where there was room -- right next to the battery on the left side, and near the wiper fluid reservoir on the right side. They actually fit quite well and snugly, so they won't move around while driving, etc. But if I were showing the car (i.e. needed to make the engine bay look clean and neat and all) I'd have to figure something else out. Luckily I'm not...
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As of March 2026, PartReview has 7 reviews across 5 manufacturers for ballast. 5 of them have enough reviews to participate in the ranking of this part.
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