I commute year-round which includes in the dark. My daytime rides are on the streets, but at night (I just realized) my rides are on paths or side streets. Tonight I rode my usual (daytime) way home which included riding with traffic, traffic lights, etc, except it was dark.
I was really spooked. All of a sudden I was afraid...of everything! I didn't feel that people could see me, I was worried about dudes heading home from the bar...it was awful. I nearly got clipped by a minivan, which didn't help. I don't think I'll ever ride at night on main roads again.
Is it something you get used to? I don't understand why it bothered me so much, but I hadn't felt that way in years - not since I first got used to riding in traffic.
I was running a Planet Bike Insight up front (15 watts) and a BRT-7 (I think its called) on the back. My panniers and jacket have reflective tape.
It was pretty scary to me. I guess I'm not the big commuter-guy after all. At least not after dark.
Stay safe and thanks for "listening".