We usually have to rely on mains powered lights at christmas time in the uk because of the lack of sunshine but these endurance solar icicle lights are designed to work in winter as long as you locate the powerful 300mah polycrystaline solar panel facing south or as near south as possible you should get some led christmas cheer without running up your electricity bill and even if the sun decides not to show itself at all you can simply detach the solar panel from the light string and bring