Don't see why you need the Bright-Bike thing if you get the Luxos U. BTW, the Luxos U can also provide USB current when the headlamp is on (in my experience at least, using an SP PD-8 hub), although charging then turns off every few minutes while its small battery recharges. Note that you can also use the Luxos U USB output to recharge batteries. The only problem with the Luxos U is getting your hands on one.