Looking for some electronics theory clarification; Almost every time a power injection question is asked someone always reminds us that the -V between the power supplies should be connected and the +V should not. I understand the reasoning, however, pixels are constructed with positive and negative busses; so actually the +Vs are connected??? Each wire on 100 ws2811 LEDs with 18awg wire is ~1.6 ohms. So, following recommendations; 5v pixels should be power injected every 100 pixels (~1.6 ohms) and 12v pixels should be power injected every ~150 pixels (~2.4 ohms). If reduced to a simple circuit there could be less then 1.6 ohms between +V on separate power supplies. Is 1.6 ohms really enough resistance to adequately separate power supplies? Does it really matter? What is the proper way to isolate the +V between power supplies?