I bought a strand of the cheap LED string lighting that you can get on Amazon for $15. I attached longer wire leads and keep the lights balled up in one of the interior pockets in the hub shanty, and when I need them, I tuck the lights between the poles and the fabric. They put off plenty of light. I bought a dimmer that I was going to wire in, but never ended up using it. I use a spare Milwaukee battery with the powersource to power them, but they do eat through a 5.0ah battery faster than I had thought they were going to.
I will probably check out Otter's new LED's that are coming out this year, depending how expensive they are.