Also, it's hard to tell what is going on in your third pic, but it looks like you are tapping into the connector with the blue and white wires. If that's the case, it looks like you've tapped into 5V from the computer's power supply. The yellow wire is 12V. If you're satisfied with the brightness of the LEDs at 5V, you don't need to tap into the computer's power supply at all, you can just run your positive wire straight from the PAC-Drive like in the first pic to your LEDs and they will get their power via USB. If I have mistaken what was going on in your third pic, ignore all this.