它们的耗电量仅是普通灯泡的三分之一，持续时间却是后者的10倍。
They use about one-third of the energy of normal bulbs and last 10 times as long.
况且一般情况下，普通灯泡仅有1,000小时左右的寿命。
A typical bulb also has to be replaced every 1,000 hours or so.
和早期的LED灯不同，现在的LED灯泡看起来很象普通灯泡。
Unlike earlier versions, the new LED lamps look more like common light bulbs.
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