DGP
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You shouldn't have any heat issues with those heatsinks,not so sure about the cheap sinks.i run some cree 3590 at 75w each on a 140mm x 70mm with 10mm base thickness and they are right about at the border of needing fans.they run about 120 to 130f depending on a few variable like wind speeds and temps in the room.
Yeah, the surplus heat sinks worked but not quite as well as the Arctic 11 plus. So, that is what I am going with. Already ordered a bunch more from NewEgg who happens to be selling them for $7.61 right now so with shipping they are under $10.
I didn't even take formal data on the Arctic 11's because the hottest spot on them never went much above 85F and only about 15F over ambient. The surplus ones were about 25F over ambient.
I completed testing yesterday of the first fixture I built and it is already running some rooted clones in the veg tent.
It seems Cree has always been the gold standard for the industry but I really wonder if these 90 CRI Luminous parts aren't just as good. They seem to be readily available stateside (without having to wonder about what you get from China) and are only $19 for the 50V/150W version.
DP