-
Is 20 miles just a typo?
You really need a good spread of light if your running at any speed. With a tight bright beam. you can't see what's coming until your on it. Or you need to keep looking down to track the obstacles... Its a recipe for feeling sick.
I have a Silva trail speed headlamp. However latterly I prefered using a hand lamp. One of the cheap Cree 18650 torches, which I took the lens and reflector out of, so it has a very wide beam and no hot spot. With the lamp being away from your eyes, you get better shadows of dips, rocks and roots. If it's raining, foggy or cold enough you can see your breath, you don't get dazzled.
You don't blind people when you look at them, but you do need a free hand
Head torches... I'm doing a trail race this weekend that I thought was a nice casual 20km but turns out is 20 miles (we have never used the imperial system in this country so I'm not sure what that's about, other than confusing people). It starts at 3pm, has some chunky elevation, is forecast to absolutely pelt down with rain - and sunset is at 7pm, so I'm worried about finishing in the dark. So I need a head torch... what do I look for? I know nothing about head torches... help!