I've seen some nice reviews of USB bike lights in the 300-1,200 lumens range. Many of the reviews include field photos or videos of how bright the light is.

I understand that some of the new dynamo lights are quite bright. I probably can't afford top of the line, so I might go with something that is bright, but not super bright. I ride on a lot of streets that have poor lighting at night, often in rainy conditions. However, I don't ride very fast. Usually below 15mph.

Has anyone ever seen a side-by-side comparison of USB lights vs dynamo lights?