best low light performance

The whole discussion above reminds me of one time when we were drycamping in a Walmart parking lot. I looked up at the light in the parking lot that we were parked under and wondered what kind of, and how many, solar panels it would take to charge up my batteries up by morning compliments of Walmart.

I think I've read of some posters getting power under moonlight from "solar" panels, but so far no mention of street lamps by the RV community. How much energy is wasted in this country from artificial light no one is using at the time? Maybe we need more motion activated light switches.