The biggest drawback is the noise (vibration) of the fans. The sound goes through the case and it is perfectly audible in the cabin (about 2 times louder than the cooling fan). In a quiet car - it's terribly annoying. Formally banned for use on public roads, tk. in terms of brightness, they can blind the oncoming lane when it approaches the car (at a long distance they do not blind). There is an article ZaRulem, where all this was sorted out. They are not rigidly fixed in HB3 mounts. I used it for 2 days, after which I put the halogens back, and sold these.
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