I have two XML T6 flashlights (advertised as 900 lumen, 1x18650 each). Just one on full power seems mighty bright to me.

What I wonder if that because car lights' lenses/reflectors have a much larger surface area than flashlights/bike lights, do they look less annoyingly bright? Is there such a thing as lumen "flux"/lumens per unit of area? I'm no light expert.

Edit: Just saw cyccommute's post on lux