As posts upthread have shown, the light output will be comparable to a kerosene lamp, which is what these lights are supposed to replace. It doesn't take a "crazy weight" or "a lot of elevation". And the difference between 50% efficiency and 100% efficiency is only a factor of two; that's well within the range of making reasonable adjustments in the weight and/or height.
As far as voltage/amperage is concerned, I would expect the generator to be low voltage DC, matched to some voltage in the range the LED light could support. AFAIK LED lights are fairly tolerant of a range of low DC voltages, so I don't see this as a major issue.
As far as voltage/amperage is concerned, I would expect the generator to be low voltage DC, matched to some voltage in the range the LED light could support. AFAIK LED lights are fairly tolerant of a range of low DC voltages, so I don't see this as a major issue.