I have to admit it, until this thread I have never thought seriously about generator lights as an option. In the U.S. at least, battery lights predominate and are available at all price points low to money is no object. Performance varies too and I am finding out that more money is not always indicative of more performance. At least that is mostly true in the ~$100 - ~$300 working range of reasonable bang for the buck.
AFAIK there are no cheap knock-off generator hubs giving competition to Shimano and the European players in that market. So, in the U.S. at least someone who wants generator light will have to shell out $$$ for the hub and even more for the light. I see a lot of contact type generators on European bikes but I have read too many "just don't do it" admonishments by cycling authors re: tire contact generators.
Ironically, I think a similar situation exists with IGH (internal gear hubs) in the U.S. Here the derailleur is king and IGH comes at a significant price premium even for three and five speed hubs. Only one company to my knowlege has attempted to combine multiple derailleur speeds and multiple IGH speeds: Sachs. IMO if they ever got insane and put five or more internal gears along with seven or more derailleur gears they would have the Rohloff killer par excellence. One can hope.
That second paragraph was my segue into the idea of hybrid systems. IMO they work for IGH/derailleur systems but fail when it comes to generator/battery light systems. Beyond a $10 blinkie for the all important flash duties, putting serious battery light power on your handlebars IMO trumps anything obtainable at reasonable cost from a generator. Why this is I don't know. A Magicshine consumes ~3W. From what I have read here 3W and more is completely reasonable power output from a hub generator. Most generator light systems, however, stop far short of MagicShine light output levels. If you get a useable amount of light from a generator and are happy with it, rejoice. You can always carry a small tactical in your tool bag for repair projects or finding keys, etc. You won't (shouldn't) also need a full on battery light on your handlebar to back up your Busch and Mueller, or vice versa for that matter.
H