Since this has become the main lighting thread I will also share that hasn't been mentioned for a low beam supplement the new
Hella 500 Free Form
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It's suppose to be more focused with better cutoff than the old parabolic style and carries an SAE approval.
From what I've read even the old 500 Fogs reached out better than most low beams.
Additionally I had assumed all fogs had internal shields for good cutoff for the purpose of fog use but not so. . nearly all of the PIAA fogs have no cutoff for use in oncoming traffic. Many aftermarket fogs are simply a wide flood lamp.
I found this pic the other night interesting because I didn't think there was room for lights mounted this way but apparently there is, these are 6" KC SlimLites-