Light and Motion Stella 300 Headlamp Lumens: 300 Runtime: High-2:45 Med-5:30 Low-11:00 System Weight 232 gr. With the total system weighing in it around 216 grams, this powerful 2 cell lithium-ion rechargeable battery pack will give you up to 40 hours of useable light. Battery clip offers lots of mounting possibilities - bikes, motorcycle, helmets, backpack straps all become a perfect location to affix a powerful light. Cruise Mode offers 3 levels settings and flash. Race mode skips the Medium and Flash modes, allowing you to conserve battery power on the climbs while keeping the High setting just a click away for the descents. tool-less Bar Mount