My Cygolite 460 is plenty brought enough as a 'be seen' slight in broad daylight.
It's underpowered as a headlight when riding in total darkness. Mainly because the strobe is flashing at 460 lumens in the daytime but the constant on headlight is probably closer to 300 lumens (I'm guessing)
It's fine for the relatively lit streets I ride on in the winter when commuting. But if I were going on an unlit totally dark street it wouldn't be enough.
Daytime though...just to be noticed...it's fine.