价值120美元的节能灯泡
如果它不是与节约能源有关，你肯定不会以这么高昂的价格买一个看似普通的灯泡。下面让我们来认识一下这个灯泡：它是一个发光二极管灯泡，产生同样的光作为一个60瓦的白炽灯只有七点五瓦特-功率节省了将近百分之九十。问题是，它的成本120美元，价格上升约几倍比普通灯泡。 有趣的是，便宜的电灯泡的额定为持久的一十点零零零万小时（未经核实的）和为这些昂贵的“只有”三点零零万小时。但想到节约能源！ 它有三种颜色：热情，冷静，与软。
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