10ma is about 220 ohm. 5ma would be 430 according to a calculator on the net at 4v supply and 2v LED. So I guess I would get a 220 to 430+ ohm pot if possible, if the max current is 10ma. Or you know, put a 220 ohm on it and then a pot from 0 up to dim it. http://www.luxeonstar.com/resistor-calculator.php
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