Check the www for all the major players...Bosch, PIAA, Hella, Cibie....You will find that there are pros and cons to each depending on your personal goals. As pointed out, aiming is key. As far as a DIY method, (at least the one I used to get a tad more illumination out of the POS 9004s was that) I put my daghter's '92 Buick GS about 30 feet out in front of the Brick and lowered and reclined the power seat as low until I could jus see over the dash (which puts it at roughly normal driving height for my other daughter's '85 Prelude). I went back and forth between the cars and kept raising the level of the 9004s until they interfered with the vision of the oncoming Buick driver (in this case me) and lowered them a bit from that point. Completely unscientific, but have yet to be flashed buy oncoming drivers in close to a year. You could try a similar method with your driving lamps. FWIW, a 'good' set of driving lamps (read non-rice rocket) should have a definitive cut off line at the top of the light.

There are a lot of sites out there to give you instructions. PIAA is just one of them.

Good luck.

David