Took about 1 year. I blame less the bulb than the ballast. I had an OEM version that lasted 1.5 years so 1 year less is a lot better. I ended up replacing my left side with an LED version. I've bought several of these units, so my right side still has that bulb. I'll see how long that lasts. Interestingly, the LED I replaced the left side with is very, very similar to these. So close I forgot to switch the right side.
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