I have some 20W (low beam) H4 bulbs that are brighter than typical 55W halogen bulbs. The issue is that the heat sink makes it very hard to install the wire retaining clips. I will have to cut away the sides of the plastic housing so that my fingers can fit in to put the clip in place.
The "neck" of the bulb needs to be longer, or the housing has to have a lot of free space around it. I won't buy a bulb that has a fan on it, as this puts the longevity of the bulb onto the longevity of that tiny little fan.
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