It was not the plan to do it like this, but it was nearly impossible to solder these LED’s by hand. So I used a plastic sheet and my laser to create a stencil. A few years ago I bought a 20$ oven that should be transformed in a reflow oven, but like other projects, this never happened.
So I used the oven like this. switched it on, opened the door an put the PCB in.
Unbelievable, but ++40 seconds later, it worked on the first try 🙂