Copper? C8 pills for $4.30

[WarHawk-AVG]

@deckart

Is it not an improvement over alum to be able to solder a copper star to the brass pill ? Is this not the most important heat transfer point.
Is that not better than alum stars and arctic alumina?

djozz tests 6 different stars, found that direct thermal path whether aluminum or copper work almost the same (until you get VERY high power)

6x 20mm XML-ledboard comparison

[image] 1) common aluminium board, in fact the board the XM-L2 3B led was bought on, from Fasttech. 2) copper board with traditional dielectric layer under the central heatsink-pad, from Fasttech 3) same type of board as 2), but with the dielectric layer removed under the central pad, the gap filled with solder 4) aluminium Sinkpad, version1 (with the shallow gap on the underside of the board where the central pad was punched up) 5) aluminium Sinkpad, version2 (flat on the bottom, the edges…

That is the biggest thermal gain you can expect in emitters under say 5A