Have you looked at the flat panel light that is on sale at costco? I have two and I am really impressed at the output and how long it runs. When I bought it I was planning on testing it and returning it as garbage. I plan on using for camping and I have used one for a power outage we had here. It meets all of your criteria that you are asking for, and for around 30ish bucks it also has a gimmicky solar panel to recharge it as well, and works as a small storage cell for recharging phones. take a look a t see what you think of it.