I have no idea how you connected what and what you measure...Sorry, crystal ball still out for repair...
Ahhhhh, input voltage and input current, then yes! The converter is efficient!And the laws of power state that P = U x I. So if you want the same power to the led you need less current for a higher voltage. That's why a socket has 230V on it, not just 1.6,3V x 380mA = 2,4W10,0V = 230mA = 2,3W12,0V = 190mA = 2,3WAll pretty much the same. Not 100% but that's because the converter is pretty efficient but it's not 100% efficient and the efficiency depends a bit on the voltage. But it looks like the converter is more efficient on higher voltages.
It's not weird. The current to the led is constant. But so is the voltage over the led. Which results in a constant power. And the power is what determines the brightness Looks like the regulator is more efficient at higher voltages so less heat there. For the led it's all constant so that still needs a beefy heat sink for that 2,3W.
Got stuck with the project (wires ) and starting again!Thinner cables mean, 2 wires less.So a question arises: can I use common ground? Instead of using 6 wires per led, I could use 4?
When having a constant current sources ( X1,2,3 ) and a high power RGB LED ( Y ), can I have a common ground?X1,2,3 --> Y --> GROUND?Or do eachX1, X2, X3 need their own ground?