Think of this: If advances in efficient lighting continue at their current pace, your children's children may never know the experience of replacing a burned-out light bulb.
Take for example, a recent announcement from Phillips, for a new light bulb called the Pharox that will last 35 years if used four hours a day. The 3.4-watt LED bulb produces light comparable to an ordinary 40-watt bulb. Unlike the current compact-fluorescent options on the market, these bulbs produce a warm color reminiscent of their incandescent predecessors. Additionally, they are better for the environment than most LED equivalents because no mercury, phosphorous, lead or tungsten is used to give them that color.
With a 90% savings over traditional bulbs, could you imagine the energy the U.S. could save if only one light bulb in each household was replaced with a Pharox LED? They're still expensive at $38 a piece; but this is a bargain compared to what you get in length of life and energy savings. Check out their website for more information.