Night runs sound really cool, I will have to try it myself one day. But I'm running in my local forest/plains, with no lights. I tried it few times in winter with headlamp, but I just can't enjoy the run, when I'm not seeing my surroundings.
I actually do this a lot in winter. You have to find a lamp that works for you (brightness, the feel on your head), and I'd recommend running like this only on routes you already know well.
Naturally the pace will be slower than in the daylight, unless you have no self-preservation instinct, but it's a different kind of magic when the world shrinks to just you and the small bubble of light in front of you.