You can easily make a light “generator” simply by attaching a motor to a mini vehicle and then attaching a floodlight to it. The motor will also power anything else you care to link up.
The problem is that instead of wire you need to link things via vehicle frames. But you can climb over them anyway so it only slows you down a bit.
You could power things on the other side of the room if you got creative with frame positions. Or just put frames all the way around the outside of a room to effectively have an electrical ring circuit.