These bulbs are brighter than the original bulbs I replaced. I had 3 in the AC so I replaced them all. For this reason the number of packs of 12 made sense, they are dimmable so you can adjust them if your car has a dimmer switch. They are also polarity sensitive. So if you connect 1 and it doesn't work, change the bulb. I had 1 bad block out of 12 so I'm deducting 1 star. It's actually closer to a 4.5 rating.
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