Derek_Foppen:
i dont think so, some of the LED's still light up when they've got power. expect they're always green and uncontrollable..
And... you're about to blow up the Nano as well.
There is a "500mA absolute max" diode between the USB supply and 5volt pin.
Powering more than eight (8*60mA) addressable LEDs from that 5volt pin will send that diode to silicon heaven.
What voltage did you use on the input of that linear 5volt supply.
144 LEDs could use 8.5Amp. That's 8.5watt for every volt above 5volt.
= ~60watt with a 12volt input and an all white strip.
A 2N3055 without heatsink might be able to dissipate ~3watt.
Use a 5volt/10Amp switching supply for 144 LEDs.
Leo..