Now that Autumn is here and the nights are drawing in, us runners need a helping hand to light the way. I use the Petzl Tikka RXP head torch. This allows me to keep my hands free, which is my preferred running style.
The Tikka RXP is awesome. It is super powerful, with multiple lighting modes, and also a neat feature that dims the light in a reactive way when lighting conditions change. So for example, it can be on full blast so I can see the trail ahead, but if I look at my hand it automatically dims so I do not blind myself, and then goes back to full beam when I look back at the trail.
When wearing the head torch it is barely noticeable, and the rechargeable battery last for more than long enough for a evening or early morning run. It also takes AAA batteries to help extend the usage time.