Being in hurricane country, very familiar with long term power outages. Have plenty of candles on-hand, they're dirt cheap and there's a reason people used them for thousands of years - they don't require any maintenance or fuel (short of oxygen). Lanterns and Coleman lamps work great but storing enough fuel to use them long-term is a bit of a pain, however, we have half a dozen glass "hurricane lamps" which burn oil and they are invaluable when the lights are off for weeks at a time - it's worth getting a few of those and putting away a few gallons of the fuel - it never goes bad.
I LOVE the Cree LED lanterns and flashlights - those bulbs are amazingly tough and they put off a tremendous amount of light while using very little power. IMO you want to stay away from rechargable battery units, because what are you going to recharge them with? All of my flashlights and LED lanterns are CREE bulbs and they use everything from D-cells to AA's to C123's. The C123 Lithium batteries last a very long time in flashlights but they are expensive and will be hard to find in a SHTF scenario. Lately, I've opted for lights that can operate on D, AA, or AAA batteries, just to get some standardization with other devices such as radios, walkie talkies, etc.
Take care! :wink: