Just my two cents here...if you want to be able to dim your LED's the most effecient easiest way is to start off with a dimmable constant current driver. I am an electrical engineer (mostly control systems) and after doing tons of research I used the dimmable constant current drivers from Thomas research products.
And to confirm what others have said, there is no way you can use a voltage regulator to dim LED's being driven off of a constant current driver.
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