I tried night riding in rural areas once, but was thoroughly creeped out despite having a P7 flashlight (theor. 900 lumens). I went several miles without passing a single soul on roads that are typically quite busy, never did it again.

Night riding in urban areas is more acceptable, but non-streetlit areas I still find somewhat hazardous; as detailed in this thread even my P7 headlight was a little late in detecting a ninja jogger (I was closing at ~20mph, he was closing at ~10mph). Potholes and such also have a tendency to jump out of nowhere.