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Pedro Godoy Heat pat is below the MCPCB surface by 0.14mm. So, you need to fill the gap with solder. These still work and can keep a XHP70.2 running continuously at 10A (MCPCB), but I am using high thermal conductivity solder and water cooling. Filling the gap with regular solder may not be as effective. I also bought 20mm PCBs for XHP50 and 16mm for XHP50 and XHP70 and they do not have this issue.
Actual color is black, not white.