LEDs share some of the downsides of CFLs. They’re often bigger, uglier, and more harsh-looking than what they’re replacing, and they don’t dim very well. They aren’t bright enough to replace high-wattage bulbs yet, and they’re very expensive up front. But compared to CFLs, they use much less energy, they’re simpler, they don’t need time to warm up, they’re much more durable, and they don’t contain mercury.
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