So, it is the Luxos U, which can't charge when the light is on, but is a one party system, OR
a good headlight and thrid party gizmo and a good headlight. Can the third party gizmo (inverter??) charge while the light is on? Is that a function of the light, hub, or inverter? Do the third party gizmos have a battery cache like the Luxos U? That seems like an awfully nice feature.