You will be lucky if you get a full season out of wind up lanterns,they never seem to last too long for me.Have you considered gas lanterns,as you get the bonus of a small amount of heat as well.
------------- If the moon reflects the suns light,why does it not reflect the suns heat?
Before we moved over to Electric 2 years ago, we used to use 2 wind-up lanterns and a wind-up hand torch. If you wind it up for 10 minutes you get enough light for about 15-20 minutes.
The light given off is sufficient to navigate around the tent (we had our Coleman Cedar Creek) and make a cup-of-tea etc etc. No good for reading under. Also quite noisy when winding up.
In some ways I miss not having electric as some of the quieter, more scenic pitches are away from Electric Hook-up Points.
If you've not got electric hookup, there are several threads that discuss lights on the forums, and none seem to favour wind up lanterns as they just don't last long enough between winds, and the light output is not bright enough. We went with recommendations on this site for this one which seems to be the best price around, and have nothing but praise for it. The batteries last a long time, and it throws light all around (some of the led ones are very one directional leaving the rest of the tent in shadow).
However contrary to other posts, we have a cheap (free gift with an order for something else ) wind up torch which I am really pleased with. It doesn't have a really bright output, but it's good enough to find your way to the toilets at night, and a few turns of the handle seems to last a decent amount of time. Sometimes less bright is better - if the torch is too bright you may upset other campers at night if you accidentally illuminate their tents!
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Topic: Wind up lanterns
) wind up torch which I am really pleased with. It doesn't have a really bright output, but it's good enough to find your way to the toilets at night, and a few turns of the handle seems to last a decent amount of time. Sometimes less bright is better - if the torch is too bright you may upset other campers at night if you accidentally illuminate their tents! 
