Q8, PMS SEND TO THOSE WITH ISSUES BLF soda can light

[djozz]

@kiriba-ru

I suppose that here is no person that will be available to see any difference in ALUvsCU in this light. Or measure any temperature difference.
PCB shelf is thick enough, surface is much bigger than cutter quad boards for example.
Cu will gives almost nothing, and such board is useless for any other future projects. May be it is better to try ordering custom DTP pcbs for other, more suitable situation?

What makes the real difference in heat shedding is the direct thermal path (which btw makes it a copper board, the only aluminium DTP boards I have seen sofar are Sinkpads), but a test that I have done on 6 different 20mm XM-boards two years ago suggest (not proves, too many variables for that) that also for non-DTP boards it helps if the core is copper.

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…