Plus bulbs do not last anything like as long as normal halogen bulbs. One normal H4 on a car I've not long sold was there when I bought the car second hand in 1983 and the other I replaced in about 1984 or 5.
Set against that, I fitted a pair of plus bulbs to another car when they first came out. Had a year's guarantee and the first failed at one year one month, and the second, within a week of the first. Went back to the original bulbs which were still there three years later when I sold that car.
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