@lax123, i thank you that you want to help me. But that is basic stuff i know.
And this calculator shows what i don't understand. Why so big and short cables for LED's?
I read stuff like 0.75mm2 - 1.5mm2 on most sides.
But if you look at eldoLED POWERdrive they write 3 meters to the LEDs.
And they write 0.2mm2 per 1 ampere.
They also wrote somewhere that 6 meters is no problem with CAT cable and also wrote that
they have customers who made up to 50 meters.
What i can't find is a answerer to PWM over longer distance.
If i have a LED driver with PWM in - how long can i make the PWM line from the Arfuino
to the driver.
There is also the option to dim analog. This would change the color temperature a little.
But i can't see in the Cree datasheets what color temperature at which ampere.
They write color temperatures from 2600 to 4300 for the XP-E High-Efficiency White LEDs.
Damn is this LED stuff complicated when it comes to dimming.
I wish i had a oscilloscope