I have a German-made light (Schmidt Edelux) hooked to my Alfine generator.

The headlight beam is, indeed, shaped — it is squared off at the top and the sides. Designed that way to avoid blinding drivers.

Blinding drivers ... with a generator light? Don't laugh. This sucker is bright.

It helps that the light wastes no lumens by spraying up in the trees. All the output is reflected in the right direction.

I ordered this light on faith — I'd never seen one in action — and was stunned by the output.