Attention should move from existing sources of energy to the new renewable sources. Good examples of this are the dry process as against the wet process in the cement industry. Another is the electric arc furnace versus the conventional method of steel production. A good supply of light does not necessarily mean the consumption of a great deal of energy. If the right lamp is selected for the right type of function, it is possible to save energy.
Incandescent lamps are the least expensive to buy but are the most expensive to operate.
They have the shortest lives and are inefficient compared with other lighting types. Fluorescent lighting is used mainly indoors and is about three to four times as efficient as incandescent lighting. They last about ten times longer than the incandescent types. Compact fluorescent lamps or CFL are the most significant lighting devices developed for homes in recent years. They combine the efficiency of fluorescent lighting with the convenience and popularity of the incandescent fixtures.