I just posted a link to this, so I might as well do it again. This is on a Yamahahaha RD350, but headlights are headlights, and I might just swap it over to my CB750....
[youtube=425,350]http://www.youtube.com/watch?v=YIkGkSd6i2Q[/youtube]
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I recently upgraded an old headlight.
1. polished the old glass lens inside and out.
2. replaced the old flaking refelctor and its 35w screw-in bulb with a 'modern' tribar reflector and room for an H4 bulb
3. replaced the H4 bulb with a bixenon true HID light set up. The bixenon HID offers both high and low beam in one bulb. The bulb is mounted to an electro magnet and it actually physically moves forward and backward in the light to obtain the hi and low beams.
It puts a tremendous amount of light out there on the road, and it only sucks 35w. I often drive out in remote dark places, and this has been a very satisfying upgrade for me.
The set up cost about: $40 for the headlight housing + $20 for the tribar lens + $110 for the HID setup + $60 for the small clock that fits the headlight housing.
peace and grease.
-fang