Upfront costs make them too expensive for most general lighting applications, but experts expect that to change over the next five years as prices come down and efficiencies go up. 前期成本過(guò)高使得他們無(wú)法用于最普通的照明電器上，但是專(zhuān)家估計再有五年價(jià)格降低功效增加，這個(gè)會(huì )改善的。
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