I've already got a 1100 lumen pedal nation light, but planning a long night ride in near future and am looking for a second set (but more affordable) light.
As my existing light has external battery (and is bright as!), I am thinking to use that on the handlebar and get a second unit for my helmet. Preferably sub $50, but something that will do the job.

Thanks in advance for any recommendations.

[Mod. moved to geek gear]