Nah, I've been doing night CX with 300 lumens. Quality>quantity.
^This. I've been using some Philips light from Germany and while it's not insanely bright the optics and reflector is properly designed. Perfect vision on dark lanes. The best way I can describe it is that the light is relaxing and there's no hotspots. Unfortunately the light is heavy and the battery capacity could be better. Also the mount is a bit wobbly. Fine for a 2 hour dark spin though.
This should be the case for any StVZO approved light. Pity Philips gave up after getting the optics right and sent it out with a NiMH battery and wonky mechanics. I think the battery is a regulatory problem, StVZO have some weird rules about that.
It is some weird regulation. Really annoying. I bought the light for £30 so I'm very tempted to remove the batteries and hack in new ones. And a better mount. Unfortunately I don't know enough about electronics.
Would a higher capacity but same voltage Li-ion battery pack work?
^This. I've been using some Philips light from Germany and while it's not insanely bright the optics and reflector is properly designed. Perfect vision on dark lanes. The best way I can describe it is that the light is relaxing and there's no hotspots. Unfortunately the light is heavy and the battery capacity could be better. Also the mount is a bit wobbly. Fine for a 2 hour dark spin though.
http://www.philips.co.uk/c-p/BF48L20BBLX1/led-bike-lights-saferide