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You may be having issues finding a dimmable LED fixture due to patents Color Kinetics was awarded. They have many patents on things such as pulse width modulation (blinking LEDs to simulate dimming) and they love to protect them. Going after Chinese companies it a lot harder, but they often go after companies in the US selling such fixtures. This is why the LED fixtures we distribute actually get dimmer by lowering the power provided to each LED. But, our stuff does color mixing so that's not what you really want, plus it makes it a lot more expensive.
That's interesting, doesn't the empeg pulse the power led using PWM? I've also seen lots of circuits in electronics magazines about using PWM to dim LEDs, would the patent not cover that?
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Cheers,
Andy M