everybike light i've owned has been crap...
this time around i bought some cheap led flashlights
they are pretty good
here's a pic

stock 3xaaa

modded to 6volts...both pic's only one light on

i replaced the 3aaa with 2 3v lithium cr2's from dollar store
in future i will get rid of most of the lights body
and only use the front part sealing the back and wiring
to a switch and battery
i will probably glue them on my bike(the size of a plastic pop cap)
anyways if you look at them you will look away there that bright

just thought i'd share

thx wasp