Im just wondering here

Troll detected. And as for your answer, none. We use our mind powers and our superior intellect to build lightbulbs that screw them in themselves.
 
It depends how strong the bulb is, I suppose. A weak bulb may only require a small quantity, whereas more powerful bulbs would require more--to light it efficiently, at least. I suppose, theoretically, only one forum member would be required for any bulb, though the amount of time needed to generate sufficient electricity--assuming the forumite is doing the generating and isn't actually being used as fuel, or whatever--may be more substantial with fewer members.

Hope the above conjecture helps. It's a difficult--though pleasingly open-ended--premise. Good question.

Edit: Oh, wait. I read the question wrong. It said "change", didn't it? Not "charge". Oh, woe.
 
@Chaos:This is where on topic conversation goes to die,you should know that by know!^_^

And to answer the original question:
0
What's the point in using lightbulbs when setting the ceiling alight works just as well.^_^
 
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