I just purchased my 3rd set of Knuckle Lights over the last 8 or so years. I typically run 5 days a week between 5-10 miles per day. I use Knuckle Lights during those runs between October and March when the days are shorter in the Northeast. They recharge quickly and keep bright on the brightest setting throughout my entire run. My first 2 sets began having difficulty charging after about 4 years (seasons) of use but for the value that is good enough for me and will continue using.