Freezers will last longer without power if you don't open them. It can be worth coordinating this with your neighbors. Pool your freezers in groups of, eg 4. Empty one at a time and share the food between all 4 of you. Hopefully when you come to the last freezer its food will still be fresh because it has never been opened. By cooperating with your neighbors you made it last 4 times as long and everyone benefits.

Chest freezers stand being opened much better than upright ones, and external insulation/lagging should help an unopened one. Filling unused freezer space with ice instead of air helps too.

I'm guessing power is not so important for light as we all have dozens of ultra-bright LEDs now <img src="/images/graemlins/cool.gif" alt="" />

(I expect you know all this but I mention it in case others are reading.)