The Union UN-4268 has a very boring name, but it's a great light. 35 lux with a well shaped beam from a curved reflector at under €20 is pretty much unbeatable. But this light also has automatic switching dependent on light level (optional and intended for use with hub dynamos) and a powerful standlight which keeps it running for minutes after you've stopped.
The Basta Sprint headlight remains less expensive, but it's got a lower output than this one and doesn't have the other advanced features.
Philips Safe Ride Pedelec is a top of the range light which combines the 80 lux output of the same company's internally battery powered light with the smaller size of their excellent 60 lux dynamo light in a product designed specifically for use with pedelecs.
If you have a pedelec with less than impressive lights, there's no better upgrade on the market than this. The "motorcycle performance" comes from two high power LEDs and the best optics available which together reach 60 m without blinding oncoming cyclists or drivers.
Another thing that I like about this light is that the included mount can be used for other applications than pedelecs. In fact, it's perhaps the best possible light now available for mounting externally on velomobiles. Even the included bracket can be turned around to works for this application as you see in the attached photo.
Some DIY is needed to use the Philips Pedelec light. You have to supply both power and switching. However, this is made easy by the incredibly wide range of input voltages on which it operates - anything between 6 and 48 volts DC will do, meaning that almost all bicycle power supplies either for motor assist or for velomobile lighting, whether they're based on NiMH, Lithium or even old-school Lead Acid batteries are suitable without any extra circuitry being required.
Finally, this is of course nothing to stop you running this light on a normal bicycle used for commuting or touring. The 80 lux internal battery light from Philips provides much the same performance, but you can achieve longer running times from the pedelec light if you provide a larger battery.
You can find both lights directly by following the links above, or by browsing in our webshop.