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Not sure if you explained it anywhere in here but I thought I might add something. The reasoning behind polishing the heatsink. The more reflective the metal the more it'll relect the heat from lighting. IE it's helping to keep the heatsink from getting hot from the actual light and not just...

That's a damn big heat sink lmao. Nice work I'm hoping to build a few led lights for a side business and ordered the same Crees so fingers crossed it comes out this nice.