Ok guys, sorry for some of you, but added the shipping.
Also, @Bob_McBob, they are the same LEDs as what maukka’s tested.
So quite a bit better than what we had before, but not FA3 levels of improvement.
@Agro, that’s 0,8mm+0,040mm in this case, since the 20um figure is only in terms of radius, or one side plating.
So, the total plating thickness is 40um.
Also, the nice thing about plating is that it’s like a cold weld if done well. You can treat those as parallel conductors.
Also, here’s how I calculated the improvement:
Let’s take the large BeCu spring with a 25um copper plating(0,050mm total diameter).
Since copper is 2,6 times more conductive than BeCu C17530, it’s a virtual 0,13mm increase in total wire thickness, so a virtual wire thickness of 1,13mm.
By going with the same calculations, the spring would actually become 20–25 more conductive!
That means the resistance would go down from 9mOhms down to 7,5mOhms-7,2mOhms, without losing the good mechanical properties which were sacrificed in the 2nd gen spring by removing a coil.
So, compared to the 1st gen spring with the same mechanical properties, it’s actually a great improvement.
I still wonder why I didn’t think of that the 1st time around…
Anyway, the improvement is quite a bit larger than what you calculated, so that’s nice.
Finally, the last improvement we could do is a gold plating, but I’m going to keep it for the Ultimate spring, since it’s so expensive, especially with a copper undercoating.