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well, instead of lighting a candle you can light an L.E.D. and dispel some darkness.
take a 6V DC toy motor and attach an L.E.D. to it. you can solder an L.E.D. on the shaft
press fit a small LED. if you flip the white pulley, the motor acts like a generator and
lights up the LED. the LED burns very brightly. you can also attach the motor with a flexi
wire to the LED. this is like a street light assembly. you have a larger pulley made by
sandwiching rubber between two old CDs, the motor and LED which looks like a street light
attached to a flexi straw. if you rotate the white pulley, the small pulley will rotate
very fast and LED lights up. it looks almost like a street light and this light burns really
bright. here you can see some students playing with this in daytime, so you may no see the
LED burning, but it is burning none the less.