I have tackled this problem last spring. Since I had one extra pair of headlights from the scrapyard, I decided to refurbish them. I had the reflectors recoated in silver, i polished the projector lenses and sanded, polished and waxed the outside plastic lenses.
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I have also put in some Osram Nightbreakers and the difference is quite remarquable compared to the previous state of the light output. The only downside of those Nightbreakers could be their stated shorter lifespan, but I have already covered around 5k kms with them and they are still holding up great. I am even less bothered by this fact, since I do not use the Puma as my daily anymore.
It is still not as good as xenon lights on my other car, but I see much better at night in the Puma.
Unfortunately I could not find any photos where the light output is clearly visible. I will upolad some, when I take them.
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