Solar garden lights. awesome! gardners.com: Year-round lighting for trees, arbors, railings 100 super-bright LED bulbs per string Because they aren't tethered to an outlet, these brighter-than-ever solar-powered string lights can be used virtually anywhere. Use them in your yard all year-round to light up a favorite tree, outline an arbor, or wrap a porch railing. Day/night sensor turns them on automatically. Lights run 8 hours on a full charge.