I don't think I'd plug the lights into the UPS either. That 11 min is great if you're home. But isn't it pointless if it happens when you're at work, out of the house, or sound asleep in bed at night. I understand about the lights reseting but mine only take like 20 min at the most. I would rather use it for the powerheads or the return pump and skimmer.
But I jus prefer my generator. Cost me $299 shipped for a 2000 watt. runs my tank, fridge, and my little tv with no problem. But again this is only good if I'm home.