Dear Rocketeers,
You can greatly improve your headlights cheaply and simply by fitting the Phillips H4 'GT 150' globes, and the box even comes with two xenon park light globes as well.
As the GT 150 equipped lights are blue/white, unlike the yellow light which the stock Triumph globes produce, you possibly lose a little of the daytime visibility for others (although I doubt this, as xenon lights on cars are very conspicuous, for example) but trust me, at night you look like the Starship Enterprise and the improvement in what and how far you see is remarkable.
I have the Triumph fog lights fitted to my Rocket as well, and they are very effective for daytime (being seen) and at night (seeing things in the shorter distances at low beam).
Cheers,
vikei