You can use solar panel. You can also use small windmills. They are available in market in such sizes that you can put them on the roof of your house and believe, they produce good amount of electricity. At first, both the options may appear to be expensive, but you can later save a lot of electricity bill!

There is no free way to generate electricity, you will have to invest in something.

That said, no, one lightbulb for 2 weeks won't make a big electricity bill. If you're planning on making this a long term project, you could certainly invest in solar or wind power options, but for two weeks?

not worth it.

Solar.

hook up a generator to a bicycle and start peddling.

Solar is better for this purpose.....

hello, im thinking on raising some chicken for meat and money, and im trying to cut down on the prices so i can improve my profit, one of the things i need is to keep a lightbulb on for about 15 hours a day, and for about 2 weeks, and that makes a big electricty bill, so i want to now a free way to create enough energy to power up to 3 lightbulbs for 15 hours, and i dont want something big just something simple, also i have a small electric motor i dont know if that could help :) thanks in advance