LED bulbs have a long lifespan, and almost no need to be replaced after installation. People may forget what it is to replace bulbs in the future. In addition to being durable, this light bulb also has great potential for energy saving. According to calculations, if half of the light bulbs in the United States use light-emitting diode bulbs, 24 power plants can be shut down, billions of dollars will be saved, and carbon dioxide emissions will also be significantly reduced.
For this reason, the United States has planned to use light-emitting diode bulbs for all traffic lights by 2006, so that each intersection can save $750 a year. Despite the many benefits of this kind of light bulb, there are still two major obstacles to getting into ordinary households. One is that the price is too high. The price of each bulb is 30 pounds, while the ordinary incandescent bulb is only 35 pence, the difference is too big. Second, it is still difficult to produce white light bulbs suitable for household use.
