Where are you and what resources do you have available? Unless you are going to run the tube (CCF?) light during the bright daylight you will need a way to store the electricity, and a way to match the tube and fan to what your storage holds....in other words probably a car battery or two or three, a 12 volt fan, and a 12 volt light. You need a way to manually monitor the charging of the battery or you need a charge controller or the whole thing will die on you fairly quickly. If we are talking a less developed area/country you may have better luck making and using a windmill type generator. If you give us more details we can give you better advice.