Cygolite Hi-Flux II LED: 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) Frame-mount NiMH battery runs for 3.5 hours per charge Heavy-duty Flip-Lock handlebar bracket fits most size handlebars Charges in 6 hours; weighs 0.75 pounds combined (head and battery)