Gonna do my first DIY LED with Cree CXA3590

Well I got all my holes drilled and tapped I just gotta sand the sinks with 1000 grit wet/dry so I can get the lite scratches from the drill press.
 
Does the B version also have an internal pot? I've never really cared for having external dimming, although it might be more useful for household LED projects where using a screw driver to dim the diner room table lights might seem a bit awkward.

I can't think of many times I'd want to change the brightness of a given setup frequently enough to warrant one knob to rule them all.
 
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recieved them today. 1 had dirt? on it. What should I do, besides waiting response from supplier. @SupraSPL do you think this will cause issues, like cause a fire? thanks
 

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