This is one of the best purchases I've made in a long time, thanks to fellow SMARTies Maureen and Bessie.  It's clips securely onto a hat visor, and uses 5 super-bright LED bulbs that are prefect for running along dark, bumpy trails at night.  Plus, it helps me be more visible to cars, which is important since for most Houston drivers, the only things on the roads are them, small mammals (which are usually smushed) and other cars.   Check out a great review at one of my favorite gear sites.