Originally Posted by
jsdavis
Nominal output of an arc discharge headlamp is 3200 Lumens +/- 15%.
Yes, but it's a shaped beam with only a small amount of the light going where it will bother someone.
If the bike light in question is a shaped beam then 3200 lumens would be fine, though probably vast overkill. If it's just a conical beam then it's probably way too much and could easily blind oncoming drivers.