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Could be the bulb or the ballast. Swap the bulbs left side to right side headlights. If the dim / outtage follows the bulb, then it's the bulb and you need to replace it. If it stays out on the one side, it's probably the ballast and you need to replace that.
I'd recommend going aftermarket bulbs if it's that (Morimoto) crisper color and MUCH cheaper. Ballast you should stick to OEM.
Last edited by lolfunxion; Apr 28, 2016 at 06:23 AM.
I'm pretty sure it's the bulb. Best to replace both at the same time so that way, one isn't burning brighter than the other. Bulbs from Lexus dealerships are CRAZY! Go aftermarket and save yourself a ton of $$$.
I had 1 headlight bulb working sometimes, sometimes it would go out after a new minutes, sometimes would come on dim.
Research lead me to believe its pretty common for these bulbs to do this when they are at the end of their life.
I replaced both with the Phillips bulbs I got off Amazon, and haven't had a single issue since.