Energy Saving / Alternating Light

                      Last night while I am reading a book due power scarcity in our state power gone off then I switched on mobile flash light at the same time my colleagues also done the same thing at that moment I thought that power came because of the lighting appeared like tube light lighting then I got an idea so many people are using inverter as alternative power source during power cuts but these can serve up to 4hours maximum but instead of tube lights why don't we go for alternative lighting source which consumes very very low voltage i.e., 3V but as a tube light needs 220V u can say that one flash light is not enough for a room yes its right a room requires min 4 flash lights at four corners of the room then also they consume less power than tube lights.......