Right now LED lightbulbs have some drawbacks that will slow down their spread for some time. It’s difficult to make them able to dim or spread light evenly. They are pretty expensive too. On the other hand, they have good luminous efficiency (a measure light brightness produced per power consumption) on par with compact fluorescents. LED lightbulbs also have very high lifespans (25-30 years of normal use) without dimming over time. Plus they doesn’t contain mercury like fluorescents. I’m guessing in a couple years we can except some advances to make them attractive enough to bring them to the same level with incandescents and CFL’s.
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