Light & Motion ARC HID Headlight System

"Take a super-bright 13.5-watt HID bulb and add an ultra-light rechargeable NiMH battery and you've got a light that's hard to beat. With a custom reflector providing 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 Turbo Charger 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.: 720g."