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I would imagine you would need very different circuitry to dim a LED. It's an electronic device, where voltage is very important.
Standard dimmers just drop the voltage to the bulb, and a dumb incandescent light just goes dimmer.
Keep in mind that dimmers are GOOD for standard bulbs. They can greatly extend the life of a normal bulb. My father has a sunroom on his house with a high vaulted ceiling. All the bulbs out there are incandescent, but on a dimmer switch. I don't think he has changed a bulb in ten years. Yes, I am serious...
Of course they are still using WAY more energy than LEDs or CFLs, but at least they are staying out of landfills!
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