i haven't had a car since may 2008 (and haven't used one regularly since before then!) so i've ridden at night, yes. hell, for the vast majority of the year i've been on the road commuting at 4:45-5:45, and in seattle that's in the dark until late spring!
what i use on the e-bike is the same that i used when i was a "normal" bike commuter:
1) a bright colored jacket. mine happens to be a bright orange as it's a year or three old, but high-viz yellow seems to be the new rage. check REI: they have plenty.
2) a simple flashing, AA-powered front light. i used to run heavy, expensive lights (a Cateye Stadium 3, to be specific) and found that they weren't worth it to me. i ride mostly off of the streetlights anyway, and having that much less to unpack and stow at the end of my commute is worth it. additionally, fancy/bright lights often don't flash, and i am a fan of flashing. flashing lights, that is! pervs. :x
3) both a reflector and a flashing, AA-powered rear light. the flashing light does one thing, but doesn't reflect superbly, but a simple reflector does the trick.
4) reflectors on both of my wheels opposite the valve stems, and the reflective stripe built into my vittoria randonneur tires. my pedals might have reflectors, too. these are all incidental items.
ride carefully at night, as you would in the day, and it is no problem.