more is ALWAYS better. To think otherwise is un-American (sarcastic).

To the OP: ride with what you think is enough. Everyone has a different comfort level with the amount of ligth on the road.

Myself, I use 2 p3d's on Turbo (over 400 lumen) while riding in town. It is enough to compete with the streetlights & light up enough road to travel safetly at up to about 25mph. I have had no complaints from drivers, and no drivers pulling in front of me either.

In the pitch-black country I turn them down to Hi (still over 200 lumen) and it is plenty.

Safety on the road depends on 2 things: being both seen and identified. over-power lights that blind other users keep them from identifying you. Weak lights cause them not to notice you in the first place. The habits of other road users vary by location - use what works well for you.

One recommendation: I have found that using 2 light heads on the bars, regardless of intensity, garners more respect from drivers. Maybe it give them a reference point on how fast I'm moving, or they think I'm a motorcycle, or something. whatever, no issues with not being seen & treated with respect.