Gemini Xera 950L Light Set (4-Cell)At 950 lumens, the Gemini Xera LED Light Set means serious business in the high-power light category. Driving this powerhouse is a single Cree XM-L2 U4 LED emitter - the most efficient, high power LED on the market.The Gemini Xera is both lean and mean, weighing in at just 55g - fit for racing and fit for you.There are ten brightness levels between 10-100% for your Low, Med, High and Flash modes. Each mode is programmable so you can adjust the modes to your own liking. Fine tuning your power level allows you to take full control of your runtime.By default, the Xera is set at Low 20%, Medium 60%, High 100% and Flash 60%. To reset your modes back to these factory settings, hold down the button for 10 seconds.Handlebar and helmet mounts are bundled in the Xera Light Set for your night time activities. Use the silicone O-ring to mount the Xera onto your handlebar or your helmet.The optional head strap takes your Gemini XERA beyond cycling and into other night activities like camping, night fishing, skiing or longboarding. With a powerful light mounted to your head, the possibilities are endless with what you choose to do with it.Features: Brightness: 950 lumens Modes: Low, medium, high, flash Material: Hard anodised Aluminium Safety: Charging and thermal protection, low battery warning In the Box: Xera LED light head, High capacity 4-cell battery, smart charger, built in handlebar mount, helmet mount, silicone O-rings, extension cable Weight: Light Head: 55g; 4-Cell Battery: 229gBuy Gemini Lights from Chain Reaction Cycles, the World's Largest Online Bike Store.