Haven't had them long enough to give any indication of durability. anyway, because they keep. They are as bright as anything else. Much brighter than what I got from the factory and as bright as the brightest I've seen on the street. As for ease of installation. From the side of the device itself, it was an easy twist once I could get to my main unit. I was fortunate to get proper clarity the first time. You may find that this is a problem, but it is easy to fix. My car, a Buick Regal, wasn't suitable for the fitment, but it had more to do with the car than the lightbulb. I had to remove the head unit to remove the old one and install the new one.
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