Maybe not the answer you are looking for, but in my experience the limitations most people experience with headlights is not going to be fixed by "brighter" bulbs. The DOT has very strict limits on bulbs & sealed beam units which means, by and large, swapping around the light source isn't going to net much improvement. If you google comparisons amongst cheapo commodity bulbs and all the fancy boutique replacements (Silverstars, Crystalvision, Nighthawk, etc.) you'll find the only thing that really changes is the color temperature. Consumer Reports - whom I despise - had this quote recently:
We found that the premium bulbs, as a group, deliver a whiter light and up to 19 percent more output than the standard or OE bulbs, and that can be more pleasing for drivers. But none of the premium bulbs allowed us to see farther on our headlight test course than the standard or OE bulbs. That?s because distance is determined more by the size and shape of the lamp?s reflector or lens than by the bulb. We also found little difference in light output among the premium bulbs; no more than the differences normally experienced from power fluctuations while driving.
An interesting detail is that the brain confuses color temperature for visibility at the conscious level - whiter light is "felt" to be brighter even when objective visibility is not improved. That's a big part of the reason people who say "my boutique bulbs are brighter" are not supported by objective tests.. tests which show exactly what you'd expect: 55w bulbs put out about the same amount of light regardless of whether they are blue or yellow.
Related, if you read studies of headlight design you'll find that virtually every headlight design is lacking in a demonstrable way. For whatever reason, people who design headlights are generally not good at it - or maybe designers and beancounters sacrifice lighting for appearance or cost. I don't know. But all the studies of vehicle headlights over time show the bulk of headlights are far behind the best designs... for no good reason.
On the subject of design, remember that commodity LEDs, which have very pure, very bright light SUCK at projection. You need to spend serious dollars to get LEDs that project anywhere near as good as incandescents. And, in terms of replacement bulbs - don't get me started. Conventional headlight design is based on the specific position of the bulb filaments. Replacing an incandescent bulb with an LED changes the relationship of (or destroys completely) light source to reflector. Putting LED bulbs in incandescent housings results in nothing good - all the projection limitations of commodity LEDs combined with terrible light control, scattering light all over the road and blinding oncoming drivers. Of course, you think you can see better because you get pure white light all over the top of street signs, but you don't see further away and everyone facing you hates your guts. If a $25 Amazon bulb is all that was needed, Hella would not be selling $750 LED lights...
To that end, my personal advice would be: If you're overdriving your headlights, and you don't have an actual electrical problem (ie, less than 13v at the light) don't waste your money on bulbs. Buy some quality auxiliary lights - Hella, PIAA, etc. and mount them in the right place. An inexpensive pair of Hella 500 driving lights offers a level of light you won't find in ANY headlight. And, do make sure you're shopping driving lights, and not spot, flood or fog lights. Different beam patterns!
My $0.02, but I think if you google any of this stuff, you'll see it's all very well supported.
Edit: I don't know anything about your specific headlights, but being round you might look at Hella's 60, 90, or 120mm modular lights. You might be able to adapt the 90mm or 120mm into your housings and preserve the look. They offer conventional, Xenon, and LED light sources with modern reflector design. You can buy single beam (low or high) or dual beam. Susquehanna Motorsports sells the full line - www.rallylights.com - if you have some time and creativity, I think you will get better light and keep the factory look. If not, they also stock the FF700 which is gudncheap ? and things can get real expensive from there.
