I'm with mcrews, generally—excepting the maths.
I put $55 'Cree-like' LEDs in my Hella H-4 reflectors. I get more light with less power but the low-beam pattern is nowhere as sophisticated as the Hella halogens. Instead of the flat-topped half-circular low beam it's circular. I angled them down a little, because I hate driver's that don't dim their lights on approach (most people nowadays). Consequently there is more light but it isn't thrown down the road any farther.
internal fans are necessary and interfere with the rubber boot.
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