Princeton Tec Switchback 3-Light Bike Lighting System Princeton Tec Switchback 3 LED Rechargeable Headlight System. Whether racing or just hammering the trail, the Switchback 3 will make the whole ride a little bit easier. The best lights are not just about sheer power, but also about beam patterns that can handle all types of trail. Serious. Powerful. Dominating. The Switchback 3 for all of its power has a refined side. Includes Helmet & handlebar mounts also includes Charger.