Lumen output has been increased by approximately 35 to 215 measured lumens without any reduction in battery life when compared to the previous modelthis provides enough light to illuminate the road in front of you be seen and if using it as an ancillary light help to find your way around the campsite or the depths of your hydration packthe fully re designed drive circuit now features a new low battery warning mode to alert the user approximately 30 minutes prior to the shutdown of the lamp