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If you are asking, can I dim LED's, the answer is not much. For the most part LED's are either on or off. They require a minimum voltage to 'fire'. Generally a 750 to 1000 OHM resistor in series with the LED is required when using up to 12 volts dc or so. The large value of the resistor will allow some dimming but no way like a incandescent bulb. You can experiment with the resistor value but do not expect a big difference in the output of an LED.
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