Bicycle Paper .. [seattlepub.com] V41#6, August issue has a column on equipment.
that issue mentions lights,
and consider: too much light for you to see anything
because the other guy went max lumens light saber arms race,
and is turning the MUP from night into day.. blinding the other driver is not a good thing.

so keep those super-torches on the single tracks in the woods,
and use 'the golden rule' in populated areas , and don't blind your neighbors,
since, blind, they may run over you.