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Yes and No :), the point is that when you design a heated bed the cooper resistance change with temperature must be taken into consideration. My aim was to design it for about 80W / module @ 60 degrees this means a resistance about 1.8 ohm. Therefore at room temperature the resistance would decrease and the total power would be about 360W resulted from 1.6 ohm resistance @ 25 deg. Now the point is that I ended up at about 1.8 ohm already at room temperature therefore at 60 deg the power is actually below 300W :(.
Nevertheless thanks for pointing out the mistake in my explanations.