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I had a customer who wanted LED low beams put in to replace the stock halogens. Similar to HIDs, it needs a bypass relay to operate correctly for a lot of vehicles. How exactly this would work using an led bulb -- im not quite sure. We had the lights flicker on and off, My thoughts are that the low output on the bulbs confuses the system and attempts to turn on/off the bulbs.
Although the LEDS do not require a ballast, there's a giant fan on the back of alot of them. The manufacture did not have this in mind, and it can cause some fitment issues (the moisture cap would no longer fit onto the headlight assembly in my case).
Although when they did work, they were really bright. The bulbs I put in were phillips but the customer ended up returning them. I believe he said he paid 180 for the pair. I would assume they would be much more reliable by being more shock proof and also less likely to fail from fingerprints on the bulbs.
just my observations. They are quite expensive and hopefully will come down in price
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