Light & Motion ARC Lithium Ion Headlight

"A super-bright 13.5-watt HID bulb and add an super-light rechargeable Lithium Ion battery makes this one light, light . With a custom reflector that provids the cleanest, most even beam pattern, the ARC gives you two settings to get the most out of your light. Also includes both helmet and handlebar mounts so you'll be ready for any situation. Universal Input Li-Ion Turbocharger speeds up charge time, perfect for 24-hr races when you need a quick charge. Runtime: 13.5-watts at 3-hrs, 11-watts at 3.5-hrs. System wt.: 270g."