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Don't do it!
I fell for the trap last year when I was looking to upgrade the lighting on my motorcycle while simultaneously reducing power consumption. I bought a pair of H8 to use as low beams and leave the halogens as high beam. Unfortunately, the spacing is very tight in my motorcycle, and due to the length of the bulb, I had to figure out a way to seal the headlight assembly because the original rubber did not reach the headlight. I tested in the high beam, and while the total light output was higher than the halogens, the beam pattern was horrible. It was split in two, so each half was less bright than the halogen. This is due to the source of the light not being where the reflector was designed for.
Eventually I tried using them on low beams, extending the rubber seal by buying the closest thing I found at home depot: a garbage disposal rubber thing. On my first night ride, it proved that I could not use it. I had forked over $78 for the pair (they were new to market at the time), and have not been able to re-sell them (though have not tried very hard).
On the right is the low and high beam halogens. On the left is only LED high beam. Notice it aims higher AND lower than where it's supposed to. If you aim the headlamp assembly lower... you'll be lighting up the ground immediately in front, which isn't very helpful above 30mph... Yes, they're bright, but without proper light source location, they're not worth it.
Well, I can't post images due to low post count... but below is the link.
imgur.com/5Sb4Nqc.jpg
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