There are a few considerations when running at night:
- Making yourself visible to others, i.e. motorists, cyclists, etc.
- Providing vision for yourself
- Where to look when running
You don't want to be staring down at your feet. Like mountain biking or other high speed pursuits, you want to be looking a few feet ahead so that you know what is coming for footing. So, you want a light that can shine out ahead of you as well as down, and provides enough light to illuminate the path ahead.
My personal favorite combination (which is also mandatory for Ragnar events, which are 24 hour relay running event is as follows:
- Headlamp - You can get ones that clip onto a hat, or you can get them mounted on head straps. Find what is comfortable, if it isn't comfortable, you won't use it. My personal preference is the Petzl series of head lamps. You also need to consider the lumens, or light output. I prefer 50 lumens, as that gives me about 10 seconds of visibility at a 7 minute mile pace. If you run faster than that, you need a brighter lamp so that you don't outrun your light.
- Rear red solid or flashing light - Almost any brand will do, you just want a light in the back for visibility
- Reflective vest/clothing - You want something that will reflect both from the front and back - My person preference is Nathans, as you can get quite minimally structured vests that still provide a lot of reflection.
As long as you have the basic elements of a light in front for footing, a light to the rear to alert others, and some sort of front/rear reflective capability, you should be fine to run if there isn't much illumination.