65" Spectre tv 300 LED count but only using 274 (this has been modified in the led count on the sketch) 5v 20 amps powered on both sides of the LED strip (5m Uncut) Arduino UNO r3 pin 6 for data and ground pin also used. Connected to RPI 3 VIA usb cable (baudrate set to 500000) RPI 3 connected to 5v with HDMI to USB capture card (decent...) (baudrate set to 500000) (OpenElec 7.0.1) eczoo 4k splitter coming from Shield tv Everything is working probably but my only issue is at full MAX brightness (all white) I get flickers going around everywhere. It can be pretty annoying. I thought a level shifter would be the key but it seems that the IO pins on the Arduino UNO are already 5V, So I dont think this would help. But I do have a level shifter if anyone has a suggestion. It could be my power supply, Its rated for 20 amps..... I ordered a 30amp which will be here Saturday just in case. Based On calculations it shouldnt be there in my opinon. Does anyone have any other suggestions?