 During the heating season heat produced by the bulbs is not wasted, although in most cases it is more cost effective to obtain heat from the heating system.Regardless, over the course of a year a more efficient lighting system saves energy in nearly all climates.Since incandescent light bulbs use more energy than alternatives such as CFLs and LED lamps, many governments have introduced measures to ban their use, by setting minimum efficacy standards higher than can be achieved by incandescent lamps.