The moon comet mk ii front light has a compact design that will generate up to a bright 130 lumens the 8 different modes allow you to tailor the light you need for your ride from the brightest output to an increased run time with both flashing and standard options the rechargeable lithium polymer battery will offer you up to 21 hours of runtime and the charging indicator light lets you know when it is running low charging amp fully charged this moon front bike l