Cygolite Hi-Flux II LED Xtra: High-Brightness LED Bike Light with Frame Mount NiMH Battery LED bike light with 3rd-generation, high-brightness LED bulb LED output equivalent of 10-watt halogen light (150 lumens) 2 brightness modes: high setting and low setting Streamlined NiMH battery runs for 50 hours on low setting Charges in 2.5 hours; weighs 0.75 pounds combined (head and battery)