Lighting or illumination is the use of light for improving visibility at night. Lighting includes the use of both artificial light sources (ie lamps), as well as natural illumination by capturing daylight (ie using windows, skylights (sometimes makeshift with soda bottles).
Artificial light sources
These include fuel-based lighting and electric lighting methods. Fuel-based lighting is often far less energy efficient than combusting (bio)fuel in using a gen-set and using the gen-set to power a lamp (even incandescents, and definitly using CF lightbulbs or LED's. That said, fuel-based lighting can be much cheaper and poor people in the majority world hence often stick to fuel-based lighting methods. In some cases (depending on the method/fuel used), it may create a lot of smoke, which has a number of negative impacts, especially on health.